Perhaps you should try some spelling variations:
hang cau » hang dau, hang ca, nhung cau
hieu van » hieu va, thien van, hieu ve
cam thuc » am thuc, nam thuc, cam thu
va thanh » gia thanh, ban thanh, va tinh
thanh vi » hanh vi, thanh va, thanh ve
ky hang » ky nang, ly hang, ky dang
thuc va » thuc vat, thuc dan, thuc day
luu tre » luu tru, cuu tre, luy tre
te sac » te sach, te san
te cac » tu cac, ve cac, te cao
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 hang cau hoi. ((hieu van) or (lieu va)) cam thuc va thanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te cac)) ky hang cau hoi. ((hieu van) OR (lieu va)) cam thuc va thanh vi luu tre.
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (te cac)) ky hang cau hoi. ((hieu van) or (lieu va)) cam thuc va thanh vi luu tre*.