Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
cua viet » ca viet, hoa viet, cua vat
mai hoi » dai hoi, lai hoi, mai doi
hieu le » hieu ve, hieu he, hieu ly
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
vu cac » va cac, tu cac, ve cac
na thu » nam thu, va thu, ma thu
thu va » thuc va, thue va, tu va
di cua » dai cua, doi cua, de cua
le na » le nam, le va, le ta

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "vu cac ky nang ((mai hoi) OR (mai khoi)). hieu le na thu va hanh di cua viet~".
• Adding a wildcard symbol may retrieve word variants: vu cac ky nang ((mai hoi) OR (mai khoi)). hieu le na thu va hanh di cua viet*.