Perhaps you should try some spelling variations:
sieu viet » su viet, dien viet, bien viet
hieu viec » nhieu viec, hieu ve, hieu hien
nang xa » nang x, lang xa, nang ma
sach ky » sac ky, sach y, sach ty
cac lop » cac hop, cac loai
lop van » lo van, long van, loai van
van anh » van thanh, tuan anh, van minh
tu sach » thu sach, su sach, te sach
va cau » van cau, va dau, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang xa hoi. ((hieu viec) or (sieu viet)) cac lop van anh ((va cau) OR (va cac)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. ((hieu viec) OR (sieu viet)) cac lop van anh ((va cau) OR (va cac)) treo*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. ((hieu viec) or (sieu viet)) cac lop van anh ((va cau) OR (va cac)) treo*".