Chrome custom search engine – help to make it work on some sites

Can someone help me with a problem I’m having? Setting up custom bookmarks just doesn’t seem to work on some sites.

I for example want one for playstationtrophies.org and it doesn’t display search terms only search.php so searching “Test” I just end up with a “404 Error. Page not found” at

https://www.playstationtrophies.org/search.phpTest

I had this working on FireFox I either downloaded it from the Firefox “find more search engines” or I edited a different one manually.

On Firefox I had the file with the following:

    <SearchForm>http://www.playstationtrophies.org/</SearchForm>
    <os:Url type="text/html" method="POST" template="http://www.playstationtrophies.org/search.php">
      <os:Param name="search" value="{searchTerms}"/>
    </os:Url>
    </SearchPlugin>

How can I make this work with Chrome’s simple “%s” for custom searches?

Thank you so much for any help.

Regards