Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
day hanh » day nhanh, day thanh, dao hanh
cam thuc » am thuc, nam thuc, can thuc
cam thu » nam thu, cac thu, ca thu
su sach » vu sach
so sach » so sanh, bo sach, co sach
cao hoc » co hoc, cho hoc, chat hoc
hieu ve » hieu va, hieu van
v nang » va nang, vu nang, van nang
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) or (so sach)) v nang cao hoc. hieu ve ((cam thuc) OR (cam thu)) day hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) v nang cao hoc. hieu ve ((cam thuc) OR (cam thu)) day hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) v nang cao hoc. hieu ve ((cam thuc) OR (cam thu)) day hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) v nang cao hoc. hieu ve ((cam thuc) OR (cam thu)) day hanh vi cua triet*.