Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
te sach » toc sach
y quang » ly quang, _ quang, x quang
cua hoi » cua moi
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac nuoc
danh vi » hanh vi, danh di, danh va
dinh vi » dinh ve, dinh viet, dinh tri
ca hoi » cau hoi, xa hoi, co hoi
luc va » duc va, tuc va, loc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y quang ((ca hoi) or (cua hoi)). hieu va cac luc va ((danh vi) OR (dinh vi)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y quang ((ca hoi) OR (cua hoi)). hieu va cac luc va ((danh vi) OR (dinh vi)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y quang ((ca hoi) or (cua hoi)). hieu va cac luc va ((danh vi) OR (dinh vi)) cua viet".
• Adding a wildcard symbol may retrieve word variants: te sach y quang ((ca hoi) or (cua hoi)). hieu va cac luc va ((danh vi) OR (dinh vi)) cua viet*.