Perhaps you should try some spelling variations:
vat hanh » vat thanh, van hanh, va hanh
nam thuc » nam thuoc, am thuc, nam thu
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
hanh de » hanh ve, hanh kem
hieu va » lieu va, hieu qua
hieu ve » hieu van
tu nang » tru nang, tu nong, tu nano
cua tu » cua tuc, cua su, cua cu
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang x hoi. ((hieu ve) OR (hieu va)) nam thuc vat hanh de ((cua te) OR (cua tu))~.
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang x hoi. ((hieu ve) or (hieu va)) nam thuc vat hanh de ((cua te) or (cua tu))*.