Perhaps you should try some spelling variations:
nhieu viec » nhien viet
hieu viec » hieu ve, sieu viet, hieu hien
su sach » so sach, vu sach
va hang » van hang, va lang, va hanh
doi cua » dai cua, hoi cua
va nang » van nang, da nang, cam nang
cac thu » cach thuc, cac thoi
sach ky » sac ky, sach y, sach ty
cao hoa » cao hoat, cao khoa, cau hoa
cua tre » cua te, cuu tre, cua triet

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 hoa. ((hieu viec) OR (nhieu viec)) cac thu ((va hang) or (va nang)) doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang cao hoa. ((hieu viec) OR (nhieu viec)) cac thu ((va hang) OR (va nang)) doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang cao hoa. ((hieu viec) OR (nhieu viec)) cac thu ((va hang) or (va nang)) doi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang cao hoa. ((hieu viec) OR (nhieu viec)) cac thu ((va hang) or (va nang)) doi cua tre*.