Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
cua viet » ca viet, hoa viet, cua vat
van cham » van chat, van tham, va cham
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
so sanh » do sanh
mai hoi » mai khoi, dai hoi, lai hoi
ma hoi » xa hoi, ma hoa, me hoi
y sang » _ sang, duy sang
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 sanh) or (cho sinh)) y sang ((ma hoi) OR (mai hoi)). hieu van cham truc va hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sanh) OR (cho sinh)) y sang ((ma hoi) OR (mai hoi)). hieu van cham truc va hanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sanh) or (cho sinh)) y sang ((ma hoi) OR (mai hoi)). hieu van cham truc va hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: ((so sanh) or (cho sinh)) y sang ((ma hoi) OR (mai hoi)). hieu van cham truc va hanh vi cua viet*.