Selecting dropdown in selenium webdriver, dropdown list of elements in ul of div

I am new to the Selenium Web Driver technology, below is my question and unable to find out the solution please any one help me to find out the by x path or by cs Selector or by name.

below is code is the drop down Element in the page,

<div id="reportsManager_chzn" class="chzn-container chzn-container-single chzn-container-active" style="width: 220px;">
             <a class="chzn-single" href="javascript:void(0)" tabindex="-1">
              <span>Ajay Paul Chowdhury</span>
               <div>
                <b></b>
               </div>
             </a>
            <div class="chzn-drop" style="left: -9000px; width: 218px; top: 24px;">
             <div class="chzn-search">
              <input type="text" autocomplete="off" style="width: 183px;">
            </div>
            <ul class="chzn-results">
                <li id="reportsManager_chzn_o_1" class="active-result" style="">All</li>
                <li id="reportsManager_chzn_o_2" class="active-result" style="">wer</li>
                <li id="reportsManager_chzn_o_3" class="active-result" style="">sss</li>
                <li id="reportsManager_chzn_o_4" class="active-result result-selected" style="">www</li>
                <li id="reportsManager_chzn_o_5" class="active-result" style="">rrr</li>
                <li id="reportsManager_chzn_o_6" class="active-result" style="">yyy</li>
                <li id="reportsManager_chzn_o_7" class="active-result" style="">iii</li>
                <li id="reportsManager_chzn_o_8" class="active-result" style="">ooo</li>
                <li id="reportsManager_chzn_o_9" class="active-result" style="">ppp</li>

for the above code unable to find out the xpath/cssselector/name for the so that i can Dynamically Select the any dropdown value from the List

Please any one help me to find out the result.

for above code i tried

1) try 1

    // by Xpath and it selects the list by list ID 

       Actions manager = new Actions(driver);
       WebElement we1=driver.findElement(By.xpath("//[@id='reportsManager_chzn_o_23']"));
      manager.moveToElement(we1).moveToElement(driver.findElement(By.xpath("//[@id='reportsManager_chzn_o_3']"))).click().build().perform();
       Thread.sleep(3000);

above Selenium code will Select the dropdown element 'sss' i need code which select by name so that i can paramaterize the Dropdown List

2) try 2

      driver.findElement(By.id("reportsManager_chzn")).findElement(By.cssSelector("chzn-single")).findElement(By.name("sss")).click();

showing the error message

org.openqa.selenium.NoSuchElementException: Unable to locate element: {"method":"css selector","selector":"chzn-single"}

and the Selenium testcase is failed

3) try 3

tried by Select

   Select selectBox = new Select(driver.findElement(By.id("reportsManager_chzn")));

selectBox.selectByVisibleText("sss");

for the above shows the Error message found div instead of select

also i tried in all the way, finally i'm here

Thanks in advance