Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, cam thu, can thuc
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach, vu sach
sach va » sach xa, sach ha, sach dao
va nang » van nang, da nang, cam nang
cao hoi » cau hoi, co hoi, cao hoc
va hanh » van hanh, va thanh, va danh
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 van ((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 nang cao hoi. hieu van ((cam thuc) OR (nam thuc)) va hanh vi cua triet.
• Adding a wildcard symbol may retrieve word variants: su sach va nang cao hoi. hieu van ((cam thuc) or (nam thuc)) va hanh vi cua triet*.