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 tu, sach thu
te sach » toc sach
nang xa » lang xa, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
dan vi » doan vi, don vi, gan vi
dan va » doan va, dan ca, ban va

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