Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dao » lanh dao, thanh dat, thanh dam
hanh dai » hanh tai, vanh dai, thanh dat
cao hoc » co hoc, cho hoc, chat hoc
hieu va » lieu va
dang ha » dong ha, dung ha, lang ha
ky dang » ky nang, ky danh
xac ky » cac ky, sac ky, bac ky
ha hoi » hoa hoi, ha noi, xa hoi
su xac » pu xac, su cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ky dang ha hoi. ((hieu va) or (hieu qua)) cao hoc va ((hanh dai) OR (hanh dao)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky dang ha hoi. ((hieu va) OR (hieu qua)) cao hoc va ((hanh dai) OR (hanh dao)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky dang ha hoi. ((hieu va) or (hieu qua)) cao hoc va ((hanh dai) OR (hanh dao)) cua triet".
• Adding a wildcard symbol may retrieve word variants: su xac ky dang ha hoi. ((hieu va) or (hieu qua)) cao hoc va ((hanh dai) OR (hanh dao)) cua triet*.