Perhaps you should try some spelling variations:
kho tang » cao tang
ban hanh » ban hang
ky tang » ky nang, ky dang, ky trong
tai hoi » tai khoi, dai hoi, tai hai
hieu ve » hieu va, hieu van
ve ham » ve cham, le ham, ve am
ham so » nam so, cham soc
so ban » sao ban, so bang, co ban
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ((ky tang) OR (kho tang)) tai hoi. hieu ve ham so ban hanh ((vi cua) OR (di cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ((ky tang) OR (kho tang)) tai hoi. hieu ve ham so ban hanh ((vi cua) or (di cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: tu cac ((ky tang) OR (kho tang)) tai hoi. hieu ve ham so ban hanh ((vi cua) or (di cua)) tre*.