Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cam thuc » am thuc, nam thuc, cam thu
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cho cua » co cua, chi cua, cho ca
ve cam » ve cham, ve cac, va cam
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sac ky) or (sach y)) nang cao hoi. hieu ve cam thuc ((va danh) OR (va hanh)) cho cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sac ky) OR (sach y)) nang cao hoi. hieu ve cam thuc ((va danh) OR (va hanh)) cho cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sac ky) or (sach y)) nang cao hoi. hieu ve cam thuc ((va danh) OR (va hanh)) cho cua triet".
• Adding a wildcard symbol may retrieve word variants: su ((sac ky) or (sach y)) nang cao hoi. hieu ve cam thuc ((va danh) OR (va hanh)) cho cua triet*.