Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nang hoi » nang noi, nang ho, nang hai
nang hoc » nang doc, nang luc, dong hoc
hieu van » hieu va, thien van, lieu va
hieu ve » hieu va
sach ky » sac ky, sach y, sach ty
cac tuc » cac toc, cac tu, cac tac
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
te sach » toc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky lang xa hoi. ((hieu ve) OR (hieu van)) cac tuc xa ((nang hoi) or (nang hoc)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang xa hoi. ((hieu ve) OR (hieu van)) cac tuc xa ((nang hoi) OR (nang hoc)) cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang xa hoi. ((hieu ve) OR (hieu van)) cac tuc xa ((nang hoi) or (nang hoc)) cua triet*".