Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nam thuc » nam thuoc, am thuc, nam thu
cam thuc » am thuc, cam thu, can thuc
va hanh » van hanh, va thanh, va danh
sach va » sach xa, sach dao, sach nha
cao hoi » cau hoi, co hoi, cao hoc
sach ha » sach nha, sach han, sach xa
hieu ve » hieu va, hieu van
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 va) OR (sach ha)) nang cao hoi. hieu ve ((cam thuc) or (nam thuc)) va hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach va) OR (sach ha)) nang cao hoi. hieu ve ((cam thuc) OR (nam thuc)) va hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach va) OR (sach ha)) nang cao hoi. hieu ve ((cam thuc) or (nam thuc)) va hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach va) OR (sach ha)) nang cao hoi. hieu ve ((cam thuc) or (nam thuc)) va hanh vi cua triet*.