Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
hieu van » hieu va, thien van, hieu ve
cam thuc » am thuc, cam thu, can thuc
nam thuc » nam thuoc, am thuc, nam thu
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
te san » te ban, ke san, tu san
san ky » sang ky, van ky, dan ky
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te san ky nang cau hoi. ((hieu van) or (lieu va)) ((cam thuc) OR (nam thuc)) va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te san ky nang cau hoi. ((hieu van) OR (lieu va)) ((cam thuc) OR (nam thuc)) va hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te san ky nang cau hoi. ((hieu van) or (lieu va)) ((cam thuc) OR (nam thuc)) va hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: te san ky nang cau hoi. ((hieu van) or (lieu va)) ((cam thuc) OR (nam thuc)) va hanh vi cuu tre*.