Perhaps you should try some spelling variations:
ban thanh » ban hanh
ban hang » ngan hang
dang xay » dang van, van xay
so sach » so sanh, bo sach, co sach
cam tuc » cam xuc, cam tu, nam thuc
su viet » so viet
sach ly » sach y, sach lo, sach ty
nang xa » nang x, lang xa, nang ma
va cam » va cham, va cac, va cao
ki su » ky su

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

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