Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
te sach » toc sach
lai cua » dai cua, hai cua, lai chau
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
hieu ve » hieu van
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
sach 2 » sach y

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: te sach 2 ((nang ma) OR (nang x)) hoi. ((hieu ve) OR (hieu va)) pham duc va hanh lai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach 2 ((nang ma) or (nang x)) hoi. ((hieu ve) OR (hieu va)) pham duc va hanh lai cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach 2 ((nang ma) or (nang x)) hoi. ((hieu ve) OR (hieu va)) pham duc va hanh lai cua tre*.