Perhaps you should try some spelling variations:
ban hanh » ban hang
thuc ban » thuoc ban, thuc dan, thu ban
van tham » van thanh, van tuan, van chat
va tham » va cham, va thanh, va thuat
may hoi » may thoi, tay hoi, mai hoi
ky mang » ky nang, ke mang, ky dang
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua
sac ky » cac ky, sai ky
tu sac » tu sach, tu cac, tu san

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky mang may hoi. hieu ((va tham) OR (van tham)) thuc ban hanh ((vai cua) OR (hai cua)) viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky mang may hoi. hieu ((va tham) or (van tham)) thuc ban hanh ((vai cua) OR (hai cua)) viet~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky mang may hoi. hieu ((va tham) or (van tham)) thuc ban hanh ((vai cua) OR (hai cua)) viet*.