Perhaps you should try some spelling variations:
danh vai » danh sai, danh va, doanh van
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
ve cac » va cac, vien cac
lo van » le van, vo van, do van
so van » su van, vo van

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