Perhaps you should try some spelling variations:
van hang » van khang, van hoang, van thang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
doi su » oi su, don su, voi su
tu cai » tu cac, tu can, tu bai
tu van » tu va
cai ky » cao ky, cac ky, cam ky
dam tu » nam tu, cam tu, tam tu
di su » ki su, da su, de su

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 ve) or (hieu qua)) dam tu van hang ((di su) OR (doi su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cai ky nang xa hoi. ((hieu ve) OR (hieu qua)) dam tu van hang ((di su) OR (doi su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cai ky nang xa hoi. ((hieu ve) or (hieu qua)) dam tu van hang ((di su) OR (doi su)) triet".
• Adding a wildcard symbol may retrieve word variants: tu cai ky nang xa hoi. ((hieu ve) or (hieu qua)) dam tu van hang ((di su) OR (doi su)) triet*.