I think the search function should be changed,
Some seconds ago I wanted to search for could.
In my opinion the shortest possible word (for the search function) should consist of 4 characters.Sorry - no matches. Please try some different terms. The following words are either very common, too long, or too short and were not included in your search : could
So some users can search the thread titles directly for words like wish.
As your quotation says, common words are not included in searches. You can look for four-letter words if they're not common words.