Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nuoc gia » nuoc giai, nuoc giao, quoc gia
thanh ve » thanh va, thanh vien, thanh van
hieu ve » hieu va, hieu van
hanh ve » hanh vi, hanh va, hanh kem
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, me hoi
ve hoc » te hoc, va hoc, vi hoc

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: vu sac ky nang ((ma hoi) OR (ma hoa)). hieu ve hoc nuoc gia ((thanh ve) OR (hanh ve)) cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky nang ((ma hoi) or (ma hoa)). hieu ve hoc nuoc gia ((thanh ve) OR (hanh ve)) cua triet~".
• Adding a wildcard symbol may retrieve word variants: vu sac ky nang ((ma hoi) or (ma hoa)). hieu ve hoc nuoc gia ((thanh ve) OR (hanh ve)) cua triet*.