Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van thai » van thoai, van tai, van hai
thai son » thai den, thai do, thai hoc
thanh vi » hanh vi, thanh ve, nhanh vi
thanh va » thanh van, hanh va, thanh ha
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
son va » song va, son la, lon va

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 ky nang xa hoi. hieu van thai son va ((thanh vi) or (thanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. hieu van thai son va ((thanh vi) OR (thanh va)) cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. hieu van thai son va ((thanh vi) or (thanh va)) cua tre*.