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
dao van » do van, dang van
bac dao » bac dai, tac dao, ba dao
van bac » van ban, van bao, van hac
cua tre » cua te, cuu tre, cua triet
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
vi cua » vai cua, di cua
x hoi » o hoi, x ho, 5 hoi

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) OR (xa hoi)). hieu van bac 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) OR (xa hoi)). hieu van bac 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) OR (xa hoi)). hieu van bac dao van thanh vi cua tre*".