Perhaps you should try some spelling variations:
cua triet » su triet, va triet
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
nang xa » nang x, lang xa, nang ma
duc van » duc va, duc tan, duc manh
hanh de » hanh ve, hanh kem
tu bai » tu ban, te bai
tu bat » tu ban, tu dat

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