Perhaps you should try some spelling variations:
vat dung » van dung, va dung, viet dung
dung doi » huong doi, dung tai, dung co
sach tu » sach thu, cach tu, sach ty
qua cam » qua cham, qua cac, qua ca
cam tuc » cam xuc, cam tu, nam thuc
tuc vat » thuc vat, tuc va, tuc hat
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu
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: su ((sach tu) OR (sach y)) nang x hoi. hieu qua cam tuc vat dung doi ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach tu) or (sach y)) nang x hoi. hieu qua cam tuc vat dung doi ((cua tre) OR (cua te))~".
• Adding a wildcard symbol may retrieve word variants: su ((sach tu) or (sach y)) nang x hoi. hieu qua cam tuc vat dung doi ((cua tre) OR (cua te))*.