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