I don't know what that means.
You probably need to learn how to use the search tools. Search tools cannot be customized for individual's search methods. People using the search tools need to learn how to use them.
No, they don't need to be customised to fit with each person's own preferred methodology of executing a search. However, it would be nice if the forum search would accept "domain_create_post.sh" as a valid keyword, and if there weren't at least three different places in which you had to do a search to find things (version pages, knowledgebase, and forums). Using google with site:directadmin.com isn't really on.