<?php 
$searchs = "ver ae as ads dase asda frasad ae aes ads ad hag hags";
echo $search=rtrim(preg_replace('/\b([a-z]{1,2}|[a-z]{2}s)\b/',' ',' '.$searchs.' '));
echo "<br/>".$str=preg_replace('/[\s]+/',' ',$search);
?>

 ver       dase asda frasad         hag hags<br/> ver dase asda frasad hag hags