Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hieu van » hieu va, thien van, lieu va
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hanh vai » hanh vi, hanh va, hanh tai
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
vu san » va san, vu ban
san ky » sang ky, van ky, dan ky
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu san ky nang xa hoi. ((hieu hien) or (((hieu ve) OR (hieu van)))) cac nuoc va hanh vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu san ky nang xa hoi. ((hieu hien) OR (((hieu ve) OR (hieu van)))) cac nuoc va hanh vai cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu san ky nang xa hoi. ((hieu hien) or (((hieu ve) OR (hieu van)))) cac nuoc va hanh vai cua tu*".