Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
tan xanh » mang xanh, tan thanh, tang hanh
xanh doi » xanh di, thanh doi, tinh doi
va triet » va thiet, va trien, ve triet
thu ban » thu hang
nang xa » nang x, lang xa, nang ma
tu can » tu ban, tu cac, thu canh

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

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