Perhaps you should try some spelling variations:
van luong » van cuong, nang luong, van chuong
van duong » van dong, van dung, van phong
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien, ve triet
nang xa » nang x, lang xa, nang ma
dien su » dien tu, nien su, den su
tu cai » tu cac, tu can, tu bai
cai ky » cao ky, cac ky, cam ky
cam tu » cam thu, nam tu, dam tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cai ky nang xa hoi. ((hieu van) or (hieu qua)) cam tu ((van luong) OR (van duong)) dien su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cai ky nang xa hoi. ((hieu van) OR (hieu qua)) cam tu ((van luong) OR (van duong)) dien su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cai ky nang xa hoi. ((hieu van) or (hieu qua)) cam tu ((van luong) OR (van duong)) dien su triet".
• Adding a wildcard symbol may retrieve word variants: tu cai ky nang xa hoi. ((hieu van) or (hieu qua)) cam tu ((van luong) OR (van duong)) dien su triet*.