Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh vi » hanh vi, thanh va, thanh ve
vu khach » vu khanh, vu khac, vay khach
su sach » so sach, vu sach
ve cham » va cham, ve chat, vu cham
luc van » luoc van, luu van, duc van
su viet » so viet
ve cam » ve cac, va cam, ve cai
ban xa » ban va, ban ma, ban da
vi su » va su, ve su, ki su

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) OR (vu khach)) van ban xa hoi. hieu ((ve cam) OR (ve cham)) luc van thanh vi su viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu khach)) van ban xa hoi. hieu ((ve cam) OR (ve cham)) luc van thanh vi su viet~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu khach)) van ban xa hoi. hieu ((ve cam) OR (ve cham)) luc van thanh vi su viet*.