Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
dang xay » dang van, van xay
tuc ban » thuc ban, truc ban, tu ban
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
doi su » don su, voi su
su sac » su sach, su cac, su xac
oi su » ki su, vi su

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((nang xa) or (dang xay)) hoi. hieu va cac tuc ban thanh ((doi su) OR (oi su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((nang xa) OR (dang xay)) hoi. hieu va cac tuc ban thanh ((doi su) OR (oi su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky ((nang xa) or (dang xay)) hoi. hieu va cac tuc ban thanh ((doi su) OR (oi su)) triet".
• Adding a wildcard symbol may retrieve word variants: su sac ky ((nang xa) or (dang xay)) hoi. hieu va cac tuc ban thanh ((doi su) OR (oi su)) triet*.