Perhaps you should try some spelling variations:
quan hanh » quan thanh, quang thanh, quang khanh
hieu viec » nhieu viec, hieu ve, sieu viet
hanh dai » hanh tai, hanh dao, vanh dai
luc quan » luc luan, tac quan, qua quan
viec dai » vien dai, viec tai, viec dat
dai luc » dai luoc, dai luan, dai thuc
lang xa » lang ha, dang xay, lang van
nang ma » tang ma, sang ma, nang cao
sach ty » sach tu, sach thu, xach tay
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: tu ((sach y) or (sach ty)) ((nang ma) or (lang xa)) hoi. hieu viec dai luc quan hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach y) OR (sach ty)) ((nang ma) OR (lang xa)) hoi. hieu viec dai luc quan hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sach ty)) ((nang ma) or (lang xa)) hoi. hieu viec dai luc quan hanh dai cua tre*.