getSearchWords() don't get the real search string

I have a little problem with display the real search string was write in the search field.

Example:

In the /themes/basic/search.php
var_dump($_POST);

array(1) {
  ["words"]=>
  string(17) "000 "222 111" 333"
}

echo $_REQUEST['words'];

000 "222 111" 333

echo getSearchWords()

"000 222 111 333"

When i edit the function getSearchWords()in the /zp-core/class-search.php it's the same result.

function getSearchWords() {
return $_REQUEST['words'];
}

or

function getSearchWords() {
return $_POST['words'];
}

The real search string should be displayed.
000 "222 111" 333
Who or what removes the quotation marks?