Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
sang ky » sang kyo, dang ky, tang ky
hieu ve » hieu va, hieu van
san ky » van ky, dan ky, ban ky
ve cam » ve cham, ve cac, va cam
loc va » luc va
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((san ky) or (sang ky)) nang x hoi. hieu ve cam ((loc va) OR (hoc va)) hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((san ky) OR (sang ky)) nang x hoi. hieu ve cam ((loc va) OR (hoc va)) hanh dai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((san ky) or (sang ky)) nang x hoi. hieu ve cam ((loc va) OR (hoc va)) hanh dai cua triet".
• Adding a wildcard symbol may retrieve word variants: te ((san ky) or (sang ky)) nang x hoi. hieu ve cam ((loc va) OR (hoc va)) hanh dai cua triet*.