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