Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
tien cua » trien cua, tiep cua, khien cua
dien cua » dieu cua, dien cuc, dien cu
so sang » so sanh, so dang, so lang
sang ky » sang kyo, dang ky, tang ky
qua cac » cua cac
cac tac » cac toc, cac bac, cac dac
tac ban » tai ban, cac ban, tao ban
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "so sang ky nang x hoi. hieu qua cac tac ban thanh ((tien cua) OR (dien cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: so sang ky nang x hoi. hieu qua cac tac ban thanh ((tien cua) OR (dien cua)) tre*.