Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, sach thu
cao hoi » cau hoi, cao hoc, tao hoi
nam luc » nang luc, nhan luc, nam thuc
va hanh » van hanh, va thanh, va danh
hanh ca » hanh cac, hanh cat, hanh cua
sac ky » cac ky, sai ky
co hoi » co hoc, co loi
luc va » duc va, tuc va, loc va
ca cua » co cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ty) or (sac ky)) nang ((cao hoi) OR (co hoi)). hieu van nam luc va hanh ca cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sac ky)) nang ((cao hoi) OR (co hoi)). hieu van nam luc va hanh ca cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sac ky)) nang ((cao hoi) OR (co hoi)). hieu van nam luc va hanh ca cua triet*".