Perhaps you should try some spelling variations:
cua triet » su triet, va triet
hieu van » thien van, lieu va, hieu ve
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
duc van » duc va, duc tan, duc manh
hanh de » hanh ve, hanh kem
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky

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