Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
te sach » toc sach
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
nang o » nang co, nang ho, nang ro
vi cua » vai cua, di cua
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thuat sach)) ky nang o hoi. ((hieu van) or (hieu qua)) nam thuc va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuat sach)) ky nang o hoi. ((hieu van) OR (hieu qua)) nam thuc va hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuat sach)) ky nang o hoi. ((hieu van) or (hieu qua)) nam thuc va hanh vi cua te*.