Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec dat » vien dai, vien da, viec lam
thuc van » thuc dan, thuc va, thuc hanh
sach tu » sach thu, cach tu, sach ty
nang xa » nang x, lang xa, nang ma
hang di » hang doi, hang vi, hang dien
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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 y) or (sach tu)) nang xa hoi. hieu viec dat ((thuc van) or (thuc vat)) hang di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach y) OR (sach tu)) nang xa hoi. hieu viec dat ((thuc van) OR (thuc vat)) hang di cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach y) or (sach tu)) nang xa hoi. hieu viec dat ((thuc van) or (thuc vat)) hang di cua tre*.