Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
mai hoi » mai khoi, dai hoi, lai hoi
truc va » thuc va, thuc vat, trung va
so sanh » do sanh
hieu va » lieu va, hieu qua
sanh v » sanh va, canh v, sanh _
va cam » va cham, va cac, va cao
ma hoi » xa hoi, ma hoa, me hoi
tuc va » thuc va, tuc xa, duc va
v nang » va nang, vu nang, van nang
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 v nang ((ma hoi) OR (mai hoi)). hieu va cam ((tuc va) or (truc va)) hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh v nang ((ma hoi) OR (mai hoi)). hieu va cam ((tuc va) OR (truc va)) hanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh v nang ((ma hoi) OR (mai hoi)). hieu va cam ((tuc va) or (truc va)) hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: so sanh v nang ((ma hoi) OR (mai hoi)). hieu va cam ((tuc va) or (truc va)) hanh vi cua viet*.