It seems Q2A removes accents in search module. For example, right in this Q2A forum, if you search for these words, you can have a lot of results.
In my language, if the words have different accents, they have different meanings.
ban means to give, to bless, or department
bàn means table or desk
bán means to sell
bạn means friend or friends
bản means version; sheet; or remote mountainous hamlet
There are much more like that:
bắn : to shoot (with a gun or a bow)
bận : busy
bần : poor, also a name of a rice sauce
bẩn : dirty, untidy
And the relevancy of Q2A search module is Zero.