Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cach thuc » anh thuc, cac thu
cac thuc » cac thu, can thuc, cay thuc
hieu van » hieu va, thien van, lieu va
lo hang » ly hang, le hang, cho hang
hang ca » hang va, nang cao, hang tai
so sanh » do sanh
va hanh » van hanh, va thanh, va danh
so sach » bo sach, co sach, hoc sach
ca hoi » cau hoi, cua hoi, xa hoi
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: ((so sach) OR (so sanh)) lo hang ca hoi. hieu van ((cac thuc) or (cach thuc)) va hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) lo hang ca hoi. hieu van ((cac thuc) OR (cach thuc)) va hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (so sanh)) lo hang ca hoi. hieu van ((cac thuc) or (cach thuc)) va hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (so sanh)) lo hang ca hoi. hieu van ((cac thuc) or (cach thuc)) va hanh vi cua triet*.