Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh tai » thanh tai, hang tai, han tai
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cam tu » cam thu, dam tu, tam tu
tai va » thai va, mai va, tri va
te sac » te sach, te cac, te san
nam tu » nam thu, nam thuc
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: te sac ky nang xa hoi. ((hieu ve) OR (hieu va)) ((nam tu) or (cam tu)) va hanh tai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang xa hoi. ((hieu ve) OR (hieu va)) ((nam tu) OR (cam tu)) va hanh tai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky nang xa hoi. ((hieu ve) OR (hieu va)) ((nam tu) or (cam tu)) va hanh tai va triet".
• Adding a wildcard symbol may retrieve word variants: te sac ky nang xa hoi. ((hieu ve) OR (hieu va)) ((nam tu) or (cam tu)) va hanh tai va triet*.