Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, hieu ve
nang xa » nang x, lang xa, nang ma
duc van » duc va, duc tan, duc manh
hanh di » hanh vi, hang di, danh di
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.

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