Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh vi » hanh vi, thanh va, thanh ve
hieu van » hieu va, thien van, lieu va
te sach » toc sach
bac dao » bac dai, tac dao, bac cao
ty nang » ky nang, ty xang, ly nang
ty hang » ly hang, ty xang, thi hang
cua tre » cua te, cuu tre, cua triet
ba dao » ca dao, va dao, bo dao
vi cua » vai cua, di 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) or (ty hang)) x hoi. hieu van ((bac dao) OR (ba dao)) van thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty nang) OR (ty hang)) x hoi. hieu van ((bac dao) OR (ba dao)) van thanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty nang) or (ty hang)) x hoi. hieu van ((bac dao) OR (ba dao)) van thanh vi cua tre*".