Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh hai » thanh hai, nhanh hai, hang hai
thuc van » thuc vat, thuc va, thuc hanh
thuc dan » thuc hanh, hoc dan, thuc vat
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
sanh ky » hanh ky, sang ky, nganh ky
tuc dan » thuc day, tung dan, tuc tang
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
hai cua » thai cua, dai cua, hoi cua
so sanh » do sanh
ma hoi » mai hoi, xa hoi, ma hoa

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 ky tang ma hoi. hieu ve cham ((((thuc dan) or (tuc dan))) or (thuc van)) hanh hai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ky tang ma hoi. hieu ve cham ((((thuc dan) OR (tuc dan))) OR (thuc van)) hanh hai cua viet*.