Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cam thuc » am thuc, cam thu, can thuc
dau nang » da nang, dai nang, dau bang
nam thuc » nam thuoc, am thuc, nam thu
va hanh » van hanh, va thanh, va danh
su sach » so sach
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, vu khach
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) OR (vu sach)) dau nang xa 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) OR (vu sach)) dau nang xa 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) OR (vu sach)) dau nang xa hoi. hieu ve ((cam thuc) or (nam thuc)) va hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) dau nang xa hoi. hieu ve ((cam thuc) or (nam thuc)) va hanh vi cua triet*.