Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
cam thuc » am thuc, nam thuc, cam thu
mai khoi » mai khoa, tai khoa, cac khoi
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
ve cam » ve cham, ve cac, va cam
cam ky » cao ky, cac ky
vi cau » ve cau, di cau, viet cau
va cau » van cau, va cac, va dau
tu cam » tu cham, tu cac, tu nam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu cam ky nang ((ma hoa) or (mai khoi)). hieu ve cam thuc va thanh ((vi cau) OR (va cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cam ky nang ((ma hoa) OR (mai khoi)). hieu ve cam thuc va thanh ((vi cau) OR (va cau)) tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cam ky nang ((ma hoa) or (mai khoi)). hieu ve cam thuc va thanh ((vi cau) OR (va cau)) tren*".