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

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