Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hoang van » hang va
va thanh » gia thanh, va tinh, le thanh
hieu van » hieu va, thien van, lieu va
te sach » toc sach
van cau » van dau, van hau, van chat
cau loc » hau loc, cau hoc, cau luc
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang x) OR (hoang van)) hoi. hieu van cau loc ((va thanh) OR (ban thanh)) vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang x) or (hoang van)) hoi. hieu van cau loc ((va thanh) OR (ban thanh)) vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang x) or (hoang van)) hoi. hieu van cau loc ((va thanh) OR (ban thanh)) vi cua tre*.