Perhaps you should try some spelling variations:
bien viet » dien viet, tieng viet, trien viet
sieu viet » su viet, dien viet, viet viet
tu sach » thu sach, te sach, tu cach
vai cuu » vai cua
anh vai » anh va, anh bai, anh van
van anh » van thanh, tuan anh, van minh
cuu tre » cua tre, cau tren, cau treo
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
cac vo » cac co, cac vi, cac bo

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