Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
viec dan » viec dang, viec ban, viec dat
thuc cao » thuoc cao, thuc co, thuc can
dan thuc » dan toc, am thuc
sach ty » sach y, sach thu, xach tay
nang xa » nang x, lang xa, nang ma
sach tu » sach thu, cach tu, sach uu
cua tre » cua te, cuu tre, cua triet
dan vi » doan vi, dan va, gan vi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ty) OR (sach tu)) nang xa hoi. nhieu viec dan thuc cao ((dan vi) or (don vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach tu)) nang xa hoi. nhieu viec dan thuc cao ((dan vi) OR (don vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) OR (sach tu)) nang xa hoi. nhieu viec dan thuc cao ((dan vi) or (don vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) OR (sach tu)) nang xa hoi. nhieu viec dan thuc cao ((dan vi) or (don vi)) cua tre*.