Perhaps you should try some spelling variations:
va thieu » va thiet, va hieu, va tieu
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ty nang » ky nang, ty hang, ly nang
ve chat » va chat, van chat
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
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 ((ty nang) or (ty xang)) mai hoi. hieu ve chat ((luc va) or (tuc va)) hanh vai va thieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty xang)) mai hoi. hieu ve chat ((luc va) OR (tuc va)) hanh vai va thieu.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ty xang)) mai hoi. hieu ve chat ((luc va) or (tuc va)) hanh vai va thieu*.