Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach nay » sach hay, sach vay, sach nang
hanh lai » hanh lam, hanh tai, thanh lap
lai cua » dai cua, hai cua, lai chau
va hanh » van hanh, va thanh, va danh
cau tuc » cau truc, cau tu, cau luc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
cong ha » cong hoa, dong ha, cong tac
long ha » dong ha, dong hoa, cong hoa
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach nay ((long ha) or (cong ha)) hoi. ((hieu ve) or (hieu va)) cau tuc va hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach nay ((long ha) OR (cong ha)) hoi. ((hieu ve) OR (hieu va)) cau tuc va hanh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach nay ((long ha) or (cong ha)) hoi. ((hieu ve) or (hieu va)) cau tuc va hanh lai cua tre*.