Perhaps you should try some spelling variations:
nhieu viec » nhien viet
hieu viec » hieu ve, sieu viet, hieu hien
cao hoat » cac hoat, co hoat, cao chat
van nang » van quang, van ban, van dong
thu van » thuc van, thuy van, tu van
su sach » so sach, vu sach
cac thu » cach thuc, cac thoi
sach ky » sac ky, sach y, sach ty
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang cao hoat. ((hieu viec) or (nhieu viec)) cac thu van nang ((vi cua) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang cao hoat. ((hieu viec) OR (nhieu viec)) cac thu van nang ((vi cua) OR (di cua)) tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang cao hoat. ((hieu viec) or (nhieu viec)) cac thu van nang ((vi cua) or (di cua)) tre*.