Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hieu van » thien van, lieu va, hieu ve
thanh vi » hanh vi, thanh va, thanh ve
sach ky » sac ky, sach y, sach ty
te sach » toc sach
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
ly ban » uy ban, lo ban
ly bai » ly dai, ly hai
vi va » vi van, vai va, vu 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 sach ky nang xa hoi. ((hieu va) or (hieu van)) cac ((ly ban) OR (ly bai)) thanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. ((hieu va) OR (hieu van)) cac ((ly ban) OR (ly bai)) thanh vi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. ((hieu va) or (hieu van)) cac ((ly ban) OR (ly bai)) thanh vi va triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. ((hieu va) or (hieu van)) cac ((ly ban) OR (ly bai)) thanh vi va triet*.