A few months ago we changed the default search behavior so that it takes users to the search results page instead of an explicit match. The reasoning was:
I was fairly skeptical of this approach when it was implemented, but decided to go along with it and see what the reaction was. We now have an official complaint, so I think we should revisit the issue.
Although it is more complicated to implement, I think the search bar should work as follows:
(The difference is whether we pass 'fulltext' in the search submission.)
Complaint can be read at https://en.wiktionary.org/wiki/Wiktionary:Grease_pit/2014/April#Diacritic_differentiation_in_search_box (skip the first few posts).