Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dang khoa » dung khoa, hang khoa, dong khoa
dang khoi » dung khoa, hang khoa
hanh dai » hanh tai, hanh dao, vanh dai
cao hoc » co hoc, chat hoc
va hanh » van hanh, va thanh, ban hanh
cho hoc » co hoc, khoa hoc
hieu va » lieu va, hieu qua
xac ky » cac ky, sac ky, bac ky
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 khoa) OR (dang khoi)) hoi. hieu va ((cao hoc) or (cho hoc)) va hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky ((dang khoa) OR (dang khoi)) hoi. hieu va ((cao hoc) OR (cho hoc)) va hanh dai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky ((dang khoa) OR (dang khoi)) hoi. hieu va ((cao hoc) or (cho hoc)) va hanh dai cua triet".
• Adding a wildcard symbol may retrieve word variants: su xac ky ((dang khoa) OR (dang khoi)) hoi. hieu va ((cao hoc) or (cho hoc)) va hanh dai cua triet*.