Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, hieu hien
sieu viet » su viet, dien viet, bien viet
ban nuoc » ban duoc, ban nuoi, ban thuoc
so sach » so sanh, bo sach, hoc sach
co sach » bo sach, cuon sach, hoc sach
nang xa » nang x, lang xa, nang ma
va danh » va dinh, va dan, va hanh
danh tu » anh tu, doanh thu
cua tre » cua te, cuu tre, cua triet
tu cua » hu cua, vu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (co sach)) ky nang xa hoi. ((hieu viec) OR (sieu viet)) ban nuoc va danh tu cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) ky nang xa hoi. ((hieu viec) OR (sieu viet)) ban nuoc va danh tu cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (co sach)) ky nang xa hoi. ((hieu viec) OR (sieu viet)) ban nuoc va danh tu cua tre".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (co sach)) ky nang xa hoi. ((hieu viec) OR (sieu viet)) ban nuoc va danh tu cua tre*.