Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
dung doi » huong doi, dung tai, dung co
vat dung » van dung, va dung, viet dung
doi cua » dai cua, hoi cua
hoc vat » hoc va, hoc viet, thuc vat
cam hoc » cao hoc, am hoc, cam hoa
sang ky » sang kyo, dang ky, bang ky
hieu ve » hieu va
tang ky » dang ky, trong ky, tang khu
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 ((sang ky) or (tang ky)) nang x hoi. ((hieu ve) OR (hieu van)) cam hoc vat dung doi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sang ky) OR (tang ky)) nang x hoi. ((hieu ve) OR (hieu van)) cam hoc vat dung doi cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sang ky) or (tang ky)) nang x hoi. ((hieu ve) OR (hieu van)) cam hoc vat dung doi cua triet*".