Perhaps you should try some spelling variations:
nhien viet » nhin viet, nghiep viet, trien viet
nhieu vien » nhieu viec, nhiet dien, thieu nien
thuc can » thuc chan, thuc dan, thuc van
dai thuc » dan thuc, dai thu, dai thua
can dan » canh dan, cac dan, can ban
sach ty » sach tu, sach thu, xach tay
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua

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 y)) nang xa hoi. ((nhieu vien) or (nhien viet)) dai thuc can dan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach y)) nang xa hoi. ((nhieu vien) OR (nhien viet)) dai thuc can dan vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) OR (sach y)) nang xa hoi. ((nhieu vien) or (nhien viet)) dai thuc can dan vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) OR (sach y)) nang xa hoi. ((nhieu vien) or (nhien viet)) dai thuc can dan vi cua tre*.