Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
van nang » van quang, van ban, van dong
truc va » thuc va, thuc vat, trung va
hieu ve » hieu va, hieu van
so sanh » do sanh
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, tuc xa, duc va
v nang » va nang, vu nang, voi nang
vi cua » vai cua, di cua
ve cam » ve cham, ve cac, va cam

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) OR (van nang)) ma hoi. hieu ve 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) OR (van nang)) ma hoi. hieu ve 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) OR (van nang)) ma hoi. hieu ve cam ((tuc va) or (truc va)) hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: so sanh ((v nang) OR (van nang)) ma hoi. hieu ve cam ((tuc va) or (truc va)) hanh vi cua viet*.