Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
vat dung » van dung, va dung, viet dung
dung dai » duong dai, dung tai, dung dat
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
tuc vat » thuc vat, tuc va, tuc hat
cua tre » cua te, cuu tre, cua triet
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 ky nang x hoi. ((hieu va) or (hieu van)) cam tuc vat dung dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. ((hieu va) OR (hieu van)) cam tuc vat dung dai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. ((hieu va) or (hieu van)) cam tuc vat dung dai cua tre*.