Perhaps you should try some spelling variations:
vat dung » van dung, va dung, viet dung
dung doi » huong doi, dung tai, dung co
sach ty » sach tu, sach thu, xach tay
qua cac » cua cac
cac tuc » cac toc, cac tu, cac tac
tuc vat » thuc vat, tuc va, tuc hat
doi cua » dai cua, hoi cua
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.

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ty) or (sach y)) nang x hoi. hieu qua cac tuc vat dung doi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) nang x hoi. hieu qua cac tuc vat dung doi cua te.
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach y)) nang x hoi. hieu qua cac tuc vat dung doi cua te*.