Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
cua triet » cua viet, su triet, va triet
thuc cao » thuoc cao, thuc co, thuc can
dan thuc » dan toc, am thuc
hoc sach » hoc sinh, hoc cac, hoc anh
viec dan » viec dang, viec ban, viec dat
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cao dan » cao dang, cao danh, cac dan
cuu tre » cua tre, cau tren, cau treo
dan vi » doan vi, don vi, dan va
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ty nang ((x hoi) or (o hoi)). nhieu viec dan thuc cao dan vi ((cuu tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ty nang ((x hoi) OR (o hoi)). nhieu viec dan thuc cao dan vi ((cuu tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: hoc sach ty nang ((x hoi) or (o hoi)). nhieu viec dan thuc cao dan vi ((cuu tre) or (cua triet))*.