Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
huu thuc » cuu thuc, huu phuc, huu thu
co sach » bo sach, cuon sach, hoc sach
vu hanh » vu khanh, vu thanh, du hanh
thuc vu » phuc vu, thuc va, thuc ve
hieu ve » hieu va, hieu van
thi hoa » thi hoan, thi ha, thi hong
tai hoa » tai khoa, thai hoa, dai hoa
yu hang » yu zhang, yu pang, yu wang
cua tre » cua te, cuu tre, cua triet
y hang » ly hang, ty hang, _ hang
ve huu » le huu, vu huu, va huu

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach ((y hang) or (yu hang)) ((tai hoa) or (thi hoa)). hieu ve huu thuc vu hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ((y hang) OR (yu hang)) ((tai hoa) OR (thi hoa)). hieu ve huu thuc vu hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: co sach ((y hang) or (yu hang)) ((tai hoa) or (thi hoa)). hieu ve huu thuc vu hanh dai cua tre*.