let say i want to find manga with these tag "Female Fighter/s"
but i want only the Completely Scanlated ones

how to do that ? and if i can't .
will you do it one day

You just do a genre search, type in the category you want and check "only show completely scanlated manga" under extended options. And you'll get this.

世界のどこかに必ず
キミの居場所がある筈

thanks , now i know

and knowing is half the battel