Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
dau thuc » dan thuc, dai thuc, dam thuc
thuc ban » thuoc ban, thuc dan, thu ban
thanh di » thanh doi, thanh de, thanh do
su sach » vu sach
so sach » so sanh, bo sach, co sach
ky tang » ky dang, kho tang, ky trong
van dau » van dao, phan dau
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (so sach)) ((ky tang) or (ky nang)) xa hoi. hieu van dau thuc ban thanh di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ((ky tang) OR (ky nang)) xa hoi. hieu van dau thuc ban thanh di cua vat.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ((ky tang) or (ky nang)) xa hoi. hieu van dau thuc ban thanh di cua vat*.