Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
va hanh » va thanh, va danh, ban hanh
vai cua » dai cua, hai cua, bai cua
lai cua » dai cua, hai cua, lai chau
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. hieu ve pham duc ((va hanh) OR (van hanh)) ((vai cua) OR (lai cua)) cu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang x hoi. hieu ve pham duc ((va hanh) OR (van hanh)) ((vai cua) or (lai cua)) cu~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x hoi. hieu ve pham duc ((va hanh) OR (van hanh)) ((vai cua) or (lai cua)) cu*.