Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
vu khach » vu khanh, vu khac, vay khach
luoc van » luoc can, luoc va, luot van
su sach » so sach, vu sach
luc van » luu van, duc van, luc va
su viet » so viet
hieu ve » hieu va, hieu van
ban xa » ban va, ban ma, ban da
ve cam » ve cham, ve cac, va cam
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 ((luc van) OR (luoc 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 ((luc van) OR (luoc 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 ((luc van) OR (luoc van)) thanh vi su viet*.