Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
cam truc » cau truc, nam truc, lam truoc
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
hieu va » lieu va, hieu qua
hieu ve » hieu van
so sanh » do sanh
sanh y » sinh y, anh y, hanh y
ma hoi » mai hoi, xa hoi, 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 y sang ((ma hoi) OR (ma hoa)). ((hieu ve) or (hieu va)) cam truc va hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh y sang ((ma hoi) OR (ma hoa)). ((hieu ve) OR (hieu va)) cam truc va hanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh y sang ((ma hoi) OR (ma hoa)). ((hieu ve) or (hieu va)) cam truc va hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: so sanh y sang ((ma hoi) OR (ma hoa)). ((hieu ve) or (hieu va)) cam truc va hanh vi cua viet*.