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 » lang xa, nang ma, mang xa
sac ky » cac ky, sai ky
hai ve » hoai ve, hai va, hai vu
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((nang xa) OR (nang x)) 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 sac ky ((nang xa) OR (nang x)) 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 sac ky ((nang xa) OR (nang x)) hoi. hieu van dau quoc ((ban thanh) or (ban hang)) hai ve triet*".