Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
nuoc ban » nuoc san, quoc ban, buoc ban
thanh di » thanh doi, thanh de, thanh do
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va
di cua » dai cua, doi cua, de cua
cua cu » cua chu, cua cau, cua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach tu nang xa hoi. ((hieu ve) or (hieu van)) cac nuoc ban thanh di cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu nang xa hoi. ((hieu ve) OR (hieu van)) cac nuoc ban thanh di cua cu.
• Adding a wildcard symbol may retrieve word variants: te sach tu nang xa hoi. ((hieu ve) or (hieu van)) cac nuoc ban thanh di cua cu*.