Perhaps you should try some spelling variations:
ve triet » va trien, su triet
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
dinh va » dinh van, tinh va, sinh va
dinh ve » dinh ket, dinh van
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
du va » dau va, tu va, su va

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 va) or (lieu va)) cac du va ((dinh va) OR (dinh ve)) ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang xa hoi. ((hieu va) OR (lieu va)) cac du va ((dinh va) OR (dinh ve)) ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky nang xa hoi. ((hieu va) or (lieu va)) cac du va ((dinh va) OR (dinh ve)) ve triet".
• Adding a wildcard symbol may retrieve word variants: te sac ky nang xa hoi. ((hieu va) or (lieu va)) cac du va ((dinh va) OR (dinh ve)) ve triet*.