Perhaps you should try some spelling variations:
thien van » thi van
cua viet » ca viet, hoa viet, cua vat
doan dau » doan dieu, phan dau, doan va
chat soc » cham soc, chat hoc, chat doc
hieu van » hieu va, lieu va, hieu ve
sach ky » sac ky, sach y, sach ty
dan dau » danh dau, van dau, dan dat
nang xa » nang x, lang xa, nang ma
tu sach » thu sach, su sach, te sach
soc va » hoc va, loc va, doc va

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: tu sach ky nang xa hoi. ((hieu van) OR (thien van)) chat soc va ((dan dau) OR (doan dau)) cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. ((hieu van) or (thien van)) chat soc va ((dan dau) OR (doan dau)) cua viet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. ((hieu van) or (thien van)) chat soc va ((dan dau) OR (doan dau)) cua viet*.