Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
nang xa » nang x, lang xa, nang ma
duc van » duc va, duc manh, duc phan
tu bai » tu ban, tu bat, te bai
bai ky » ban ky, sai ky, bac ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu bai ky nang xa hoi. hieu van pham ((duc van) OR (duc tan)) hanh kem ((cua triet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bai ky nang xa hoi. hieu van pham ((duc van) OR (duc tan)) hanh kem ((cua triet) OR (cua vat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu bai ky nang xa hoi. hieu van pham ((duc van) OR (duc tan)) hanh kem ((cua triet) or (cua vat))".
• Adding a wildcard symbol may retrieve word variants: tu bai ky nang xa hoi. hieu van pham ((duc van) OR (duc tan)) hanh kem ((cua triet) or (cua vat))*.