The Wikipedia-Search engine is very simple and weakly.
A very cool feature is a Dictionary if a search result
is empty or < 2 or 3 hits.
In Google it is call - Did you mean:
Search: freee dictonaary - was not found, so Wikipedia:
did you mean: free dictionary.
Realisation with in PHP combination: soundex(),
levenshtein(), metaphone(), and similar_text().