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

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 vai 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 vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu nang xa hoi. ((hieu va) OR (lieu va)) ((cao thuc) or (cao thuoc)) day hanh vai 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 vai cua tre*.