Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
su sach » vu sach
ky lang » ky nang, ky dang, ky tang
so sach » so sanh, bo sach, co sach
ha hoi » hoa hoi, ha noi, va hoi
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)) ky lang ((ha hoi) or (xa hoi)). hieu van nam thuc va hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky lang ((ha hoi) OR (xa hoi)). hieu van nam thuc va hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ky lang ((ha hoi) or (xa hoi)). hieu van nam thuc va hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ky lang ((ha hoi) or (xa hoi)). hieu van nam thuc va hanh vi cua triet*.