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

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