Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
cao hoi » co hoi, cao hoc, tao hoi
nam xuc » cam xuc, nam xua, nam thuc
va hanh » van hanh, va thanh, va danh
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di 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 ky) or (sach ty)) nang ((cao hoi) OR (cau hoi)). hieu van nam xuc va hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach ty)) nang ((cao hoi) OR (cau hoi)). hieu van nam xuc va hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sach ty)) nang ((cao hoi) OR (cau hoi)). hieu van nam xuc va hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach ty)) nang ((cao hoi) OR (cau hoi)). hieu van nam xuc va hanh vi cua triet*.