The class Selenium Select has 3 methods of different option selection:
Now,
Get a list of all the option values and then check if the value contains your partial text. Something like this:
List list = driver.findElements(By.tagName("option"));
Iterator i = list.iterator();
while(i.hasNext()) {
WebElement wel = i.next();
if(wel.getText().contains("your partial text"))
{
//select this option
}
}