Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
va thieu » va thiet, va hieu, va tieu
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
ve chao » ve chat, ve cham, ve cho
va hanh » van hanh, va thanh, va danh
me hoi » le hoi
vai va » mai va, dai va, hai va
xu va » xu van, tu va, su 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 ((((xa hoi) or (me hoi))) or (mai hoi)). hieu ve chao xu va hanh vai va thieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((((xa hoi) OR (me hoi))) OR (mai hoi)). hieu ve chao xu va hanh vai va thieu.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((((xa hoi) or (me hoi))) or (mai hoi)). hieu ve chao xu va hanh vai va thieu*.