#Sphinx | Morphology preprocessors
▻http://sphinxsearch.com/docs/2.0.6/conf-morphology.html
Morphology preprocessors can be applied to the words being indexed to replace different forms of the same word with the base, normalized form. For instance, English stemmer will normalize both “dogs” and “dog” to “dog”, making search results for both searches the same.
Built-in preprocessors include English stemmer, Russian stemmer (that supports UTF-8 and Windows-1251 encodings), #Soundex, and #Metaphone.