Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
vu sach » vu bach, su sach, vu khach
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
cac luc » cau luc, coc luc, cac nuoc
va hanh » van hanh, va thanh, va danh
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu sach)) ky nang ((ma hoa) OR (mai hoi)). hieu ve cac luc va hanh vi cua vat~.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu sach)) ky nang ((ma hoa) or (mai hoi)). hieu ve cac luc va hanh vi cua vat*.