Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
hanh than » hanh han, hanh nhan, hanh phan
cua triet » cua viet, su triet, va triet
viec cac » vien cac, viec cua, viec lam
tan hanh » tan thanh, tang hanh, toan hanh
sach ty » sach tu, sach thu, xach tay
cua tre » cua te, cuu tre, dua tren
nang o » nang co, nang ho, nang ro
du tan » duc tan, duy tan, du tap
o hoi » co hoi, o hoc, o hai

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 o hoi. nhieu viec cac du tan hanh than ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach y)) nang o hoi. nhieu viec cac du tan hanh than ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach y)) nang o hoi. nhieu viec cac du tan hanh than ((cua tre) or (cua triet))*.