Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cham vuc » cham soc, pham duc, cham cuu
van hang » van khang, van hoang, van thang
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va
vuc van » duc van, luc van, thuc van
tai va » thai va, mai va, dai 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 ky nang xa hoi. ((hieu ve) OR (hieu van)) cham vuc van hang ((tai va) OR (tri va)) thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. ((hieu ve) or (hieu van)) cham vuc van hang ((tai va) OR (tri va)) thiet~".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. ((hieu ve) or (hieu van)) cham vuc van hang ((tai va) OR (tri va)) thiet*.