Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh vi » hanh vi, thanh va, thanh ve
tang ma » mang may, tang van
dan bac » dan ba, van bac, dong bac
van hac » van hoc, van ha, van hai
dat van » dao van, dat va, hat van
dam van » dao van, nam van, pham van
y tang » ky tang, 6 tang, 7 tang
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach y tang ma hoi. hieu ((dan bac) or (van hac)) ((dat van) or (dam van)) thanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y tang ma hoi. hieu ((dan bac) OR (van hac)) ((dat van) OR (dam van)) thanh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: thuat sach y tang ma hoi. hieu ((dan bac) or (van hac)) ((dat van) or (dam van)) thanh vi cua vat*.