Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hanh dai » hanh tai, hanh dao, vanh dai
ban hanh » ban hang
cam duc » cam xuc, pham duc, nam duoc
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach y ((nang xa) or (nang ma)) hoi. hieu ve ((cam duc) or (cao duc)) ban hanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y ((nang xa) OR (nang ma)) hoi. hieu ve ((cam duc) OR (cao duc)) ban hanh dai cua te.
• Adding a wildcard symbol may retrieve word variants: hoc sach y ((nang xa) or (nang ma)) hoi. hieu ve ((cam duc) or (cao duc)) ban hanh dai cua te*.