Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
tang van » dang van, hoang van, trong van
toc sach » hoc sach, doc sach, thuoc sach
thanh vi » hanh vi, thanh va, thanh ve
sach ky » sac ky, sach y, sach ty
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ve tac » va tac, ve cac, ve tai
tac le » tac ke, tuc le, mac le
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky ((sang ma) or (tang van)) hoi. hieu ve tac le van thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((sang ma) OR (tang van)) hoi. hieu ve tac le van thanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((sang ma) or (tang van)) hoi. hieu ve tac le van thanh vi cua tre*.