Perhaps you should try some spelling variations:
cao thuoc » cay thuoc, cua thuoc, nam thuoc
cao thuc » bao thuc, can thuc, cao thu
day hanh » day nhanh, day thanh, dao hanh
hanh dai » hanh tai, hanh dao, vanh dai
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach tu nang xa hoi. ((hieu va) or (lieu va)) ((cao thuc) or (cao thuoc)) day hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu nang xa hoi. ((hieu va) OR (lieu va)) ((cao thuc) OR (cao thuoc)) day hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach tu nang xa hoi. ((hieu va) or (lieu va)) ((cao thuc) or (cao thuoc)) day hanh dai cua tre*.