Perhaps you should try some spelling variations:
can thuc » dan thuc, van thuc, cay thuc
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
hanh hoi » hanh thoi, hanh noi, hanh hoa
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
tu nano » truc nano
nano xa » nano va, nano bac, nano cau
hieu va » hieu qua
hoi cua » hoi chuc
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 nano xa hoi. ((hieu va) or (lieu va)) can thuc day hanh hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu nano xa hoi. ((hieu va) OR (lieu va)) can thuc day hanh hoi cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach tu nano xa hoi. ((hieu va) or (lieu va)) can thuc day hanh hoi cua tre*.