Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
hanh di » hanh vi, hanh de, hang di
ban thi » dan thi, van thi, can thi
ban thu » van thu, ban tu, lan thu
so sach » so sanh, bo sach, co sach
mang xa » lang xa, mang may, dang xay
nang ma » tang ma, sang ma, nang cao
di cua » dai cua, doi cua, de cua
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: so sach y ((mang xa) or (nang ma)) hoi. hieu van ((ban thu) or (ban thi)) ban hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((mang xa) OR (nang ma)) hoi. hieu van ((ban thu) OR (ban thi)) ban hanh di cua te.
• Adding a wildcard symbol may retrieve word variants: so sach y ((mang xa) or (nang ma)) hoi. hieu van ((ban thu) or (ban thi)) ban hanh di cua te*.