Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuc dan » thuc hanh, hoc dan, thuc vat
thuc day » thuc vat
hieu van » hieu va, thien van, lieu va
hang ca » hang va, nang cao, hang tai
van cac » van hac, van cau, van bac
so sanh » do sanh
so sach » bo sach, co sach, hoc sach
ca hoi » cau hoi, cua hoi, xa hoi
y hang » ly hang, ty hang, yu hang
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: ((so sach) OR (so sanh)) y hang ca hoi. hieu van cac ((thuc day) or (thuc dan)) hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) y hang ca hoi. hieu van cac ((thuc day) OR (thuc dan)) hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (so sanh)) y hang ca hoi. hieu van cac ((thuc day) or (thuc dan)) hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (so sanh)) y hang ca hoi. hieu van cac ((thuc day) or (thuc dan)) hanh vi cua triet*.