Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
van hanh » van thanh, ban hanh, van anh
tang ma » mang may, tang van
cac dat » cac dan, cai dat, cac dai
dat van » dao van, dat va, dam 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 van) OR (thien van)) cac dat van hanh vi cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y tang ma hoi. ((hieu van) OR (thien van)) cac dat van hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: thuat sach y tang ma hoi. ((hieu van) OR (thien van)) cac dat van hanh vi cua vat*.