Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
va thanh » gia thanh, va tinh, le thanh
cham luc » cham soc, nhan luc, cham cuu
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
sach va » sach xa, sach ha, sach dao
hieu va » lieu va
tang ma » mang may, tang van
va tang » va trang, van tang, ha tang
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: su sach va tang ma hoi. ((hieu va) OR (hieu qua)) cham luc ((va thanh) OR (ban thanh)) vai cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach va tang ma hoi. ((hieu va) OR (hieu qua)) cham luc ((va thanh) or (ban thanh)) vai cua vat~".
• Adding a wildcard symbol may retrieve word variants: su sach va tang ma hoi. ((hieu va) OR (hieu qua)) cham luc ((va thanh) or (ban thanh)) vai cua vat*.