Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cac thuc » cach thuc, cac thu, can thuc
vat hanh » vat thanh, van hanh, va hanh
hanh tai » thanh tai, hang tai, han tai
va triet » va thiet, va trien, ve triet
y tang » ky tang, 6 tang, 7 tang
tai va » thai va, mai va, tri va

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: thu sach y tang ((ma hoa) OR (xa hoi)). lieu va cac thuc vat hanh tai va triet~.
• Adding a wildcard symbol may retrieve word variants: thu sach y tang ((ma hoa) or (xa hoi)). lieu va cac thuc vat hanh tai va triet*.