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