Perhaps you should try some spelling variations:
ban thanh » ban hanh
ve triet » va trien, su triet
dau quoc » dan quoc, dau nuoc, da quoc
ban hang » ngan hang
hieu van » hieu va, thien van, lieu va
van dau » van dao, phan dau
nang xa » nang x, lang xa, nang ma
sang ky » sang kyo, dang ky, tang ky
san ky » van ky, dan ky, ban ky
hai ve » hoai ve, hai va, hai vu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((san ky) OR (sang ky)) nang xa hoi. hieu van dau quoc ((ban thanh) or (ban hang)) hai ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((san ky) OR (sang ky)) nang xa hoi. hieu van dau quoc ((ban thanh) OR (ban hang)) hai ve triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((san ky) OR (sang ky)) nang xa hoi. hieu van dau quoc ((ban thanh) or (ban hang)) hai ve triet*".