How i can get all morphology forms of the word?
For example, searching keyword is:
runner
Result should be:
run,running ... etc
You usually don't need one. Use a stemmer, which can do the reverse. ie it removes the "ending", so that matching works, rather than trying to figure out all the possible endings.
https://en.wikipedia.org/wiki/Stemming
ie use morphology, rather than worforms. http://sphinxsearch.com/docs/current.html#conf-morphology