Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
vien cac » vien bach, vien dai, vien da
tu sac » tu sach, tu cac, tu san
bo van » vo van, so van, do van
sac ky » cac ky, sai ky
ve bac » ve bao, ve cac, ve ban
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 triet) OR (va 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 triet) OR (va 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 triet) OR (va 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 triet) OR (va triet))*.