Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
hieu van » hieu va, thien van, hieu ve
thuc van » thuc vat, thuc va, thuc hanh
thuc dan » thuc hanh, hoc dan, thuc vat
thanh vi » hanh vi, thanh va, thanh ve
cuu tre » cua tre, cau tren, cau treo
te sac » te sach, te cac, te san
sac ky » cac ky, sai 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 sac ky nang cau hoi. ((hieu van) or (lieu va)) cam ((thuc van) OR (thuc dan)) thanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang cau hoi. ((hieu van) OR (lieu va)) cam ((thuc van) OR (thuc dan)) thanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky nang cau hoi. ((hieu van) or (lieu va)) cam ((thuc van) OR (thuc dan)) thanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky nang cau hoi. ((hieu van) or (lieu va)) cam ((thuc van) OR (thuc dan)) thanh vi cuu tre*.