Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hang tai » hang va, dung tai
van hang » van khang, van hoang, van thang
cham luc » cham soc, nhan luc, cham cuu
su sach » so sach, vu sach
nang xa » lang xa, nang ma, mang xa
luc van » luoc van, luu van, duc van
hieu ve » hieu va
tai va » thai va, mai va, tri va
thiet » thieu

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 y ((nang xa) OR (nang x)) hoi. ((hieu ve) OR (hieu van)) cham luc van hang tai va thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) OR (nang x)) hoi. ((hieu ve) or (hieu van)) cham luc van hang tai va thiet~".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) OR (nang x)) hoi. ((hieu ve) or (hieu van)) cham luc van hang tai va thiet*.