Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
va hanh » van hanh, va danh, ban hanh
vai cua » dai cua, hai cua, lai cua
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
va cao » va co, va dao, va bao
ma hoi » mai hoi, xa hoi, ma hoa

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 ty nang ma hoi. hieu ((va cac) OR (va cao)) xuc ((va hanh) OR (va thanh)) vai cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ma hoi. hieu ((va cac) or (va cao)) xuc ((va hanh) OR (va thanh)) vai cua vat~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ma hoi. hieu ((va cac) or (va cao)) xuc ((va hanh) OR (va thanh)) vai cua vat*.