Perhaps you should try some spelling variations:
thien van » thi van
nang cau » nang cao, hang cau, nang dau
nam thuc » nam thuoc, am thuc, nam thu
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
luu tre » luu tru, cuu tre, luy tre
sac ky » sai ky
vi luu » vi lua

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