Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
quang ca » quang cao, quang cua, quang cu
y quang » ly quang, _ quang, x quang
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
te sach » toc sach
hieu va » lieu va
cac luc » cau luc, coc luc, cac nuoc
luc va » duc va, tuc va, loc va
ca hoi » cau hoi, cua hoi, xa hoi

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