Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
van thiet » va thiet, dan thiet, can thiet
sach doi » sach hoi, sach moi, sach dao
doi xang » doi mang, doi khang, doi song
hieu van » hieu va, thien van, lieu va
van giao » nang giao, toan giao, dan gian
su sach » so sach, vu sach
xang xa » lang xa, mang xa, ang xa
va danh » va dinh, va dan, va hanh
hai van » thai van, ha van, hai tan

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: su sach doi xang xa hoi. hieu van giao duc ((va danh) OR (ban thanh)) hai van thiet~.
• Adding a wildcard symbol may retrieve word variants: su sach doi xang xa hoi. hieu van giao duc ((va danh) or (ban thanh)) hai van thiet*.