Perhaps you should try some spelling variations:
va thieu » va thiet, va hieu, va tieu
hanh vai » hanh vi, hanh va, hanh tai
sach ky » sac ky, sach y, sach ty
xuc ban » duc ban, cuc ban, quoc ban
xuc van » duc van, luc van, thuc van
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ve cham » va cham, ve chat, vu cham
ma hoi » xa hoi, ma hoa, me hoi
vai va » mai va, dai va, hai va

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 ((ma hoi) OR (mai hoi)). hieu ve cham ((xuc van) or (xuc ban)) hanh vai va thieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ma hoi) OR (mai hoi)). hieu ve cham ((xuc van) OR (xuc ban)) hanh vai va thieu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ma hoi) OR (mai hoi)). hieu ve cham ((xuc van) or (xuc ban)) hanh vai va thieu".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ma hoi) OR (mai hoi)). hieu ve cham ((xuc van) or (xuc ban)) hanh vai va thieu*.