Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
vien cac » vien bach, vien dai, vien da
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua
ve bac » ve bao, ve cac, ve ban
sac ky » cac ky, sai ky
bo van » vo van, so van, do van
tu sac » tu sach, tu cac, tu san
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang x hoi. hieu ((ve bac) or (vien cac)) bo van hanh ((vai cua) OR (hai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang x hoi. hieu ((ve bac) OR (vien cac)) bo van hanh ((vai cua) OR (hai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang x hoi. hieu ((ve bac) or (vien cac)) bo van hanh ((vai cua) OR (hai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x hoi. hieu ((ve bac) or (vien cac)) bo van hanh ((vai cua) OR (hai cua)) triet*.