Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban thanh » ban hanh, ban hang
thanh le » thinh le, thanh ve, thanh de
duc ban » duc tan, duc van, dua ban
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
so sach » bo sach, co sach, hoc sach
nang ma » tang ma, sang ma, mang may
so sanh » do sanh
ve cam » ve cham, ve cac, va cam
le cua » ly 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)) nham ((nang ma) or (nang cao)) hoi. hieu ve cam duc ban thanh le cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) nham ((nang ma) OR (nang cao)) hoi. hieu ve cam duc ban thanh le cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (so sanh)) nham ((nang ma) or (nang cao)) hoi. hieu ve cam duc ban thanh le cua triet".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (so sanh)) nham ((nang ma) or (nang cao)) hoi. hieu ve cam duc ban thanh le cua triet*.