Perhaps you should try some spelling variations:
sieu viet » su viet, dien viet, viet viet
bien viet » dien viet, tieng viet, trien viet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van anh » van thanh, van minh
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
cac vo » cac co, cac vi, cac bo
tuan » quan, tran, luan

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. ((sieu viet) or (bien viet)) cac vo ((van anh) OR (tuan anh)) vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. ((sieu viet) OR (bien viet)) cac vo ((van anh) OR (tuan anh)) vai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. ((sieu viet) or (bien viet)) cac vo ((van anh) OR (tuan anh)) vai cuu tre*".