Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, hieu ve
thanh di » thanh doi, thanh de, thanh do
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cac duc » cac du, cao duc, cac dac
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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 ty nang x hoi. ((hieu van) or (lieu va)) cac duc ban thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang x hoi. ((hieu van) OR (lieu va)) cac duc ban thanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ty nang x hoi. ((hieu van) or (lieu va)) cac duc ban thanh di cua tre*.