Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cam thuc » am thuc, nam thuc, cam thu
va thanh » gia thanh, va tinh, le thanh
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
hieu ve » hieu va, hieu van
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam
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 ma hoi. hieu ve cam thuc ((va thanh) OR (ban thanh)) ((vi cua) OR (di cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky tang ma hoi. hieu ve cam thuc ((va thanh) OR (ban thanh)) ((vi cua) or (di cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: tu cac ky tang ma hoi. hieu ve cam thuc ((va thanh) OR (ban thanh)) ((vi cua) or (di cua)) tre*.