Perhaps you should try some spelling variations:
va thieu » va thiet, va hieu, va tieu
hanh vai » hanh vi, hanh va, hanh tai
chat xuc » chat huu, cam xuc, chao xu
mai khoi » mai khoa, tai khoa, cac khoi
mai hoi » dai hoi, lai hoi, mai doi
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, te sach, tu cach
xuc va » duc va, tuc va, luc va
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) OR (su sach)) ky nang ((mai hoi) or (mai khoi)). hieu ve chat xuc va hanh vai va thieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang ((mai hoi) OR (mai khoi)). hieu ve chat xuc va hanh vai va thieu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky nang ((mai hoi) or (mai khoi)). hieu ve chat xuc va hanh vai va thieu".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky nang ((mai hoi) or (mai khoi)). hieu ve chat xuc va hanh vai va thieu*.