Perhaps you should try some spelling variations:
hanh don » hanh dong, nhanh dong, hanh doanh
ban hanh » ban hang
nam thuc » nam thuoc, am thuc, nam thu
dang xay » dang van, van xay
so sach » so sanh, bo sach, co sach
cam tuc » cam xuc, cam tu, dam thuc
sach lo » sach dao, sach doi, sach hoi
nang xa » nang x, lang xa, nang ma
su tien » su kien, su hien, tu tieng
don su » dong su, down su, dan 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 lo ((nang xa) or (dang xay)) hoi. hieu qua ((cam tuc) or (nam thuc)) ban hanh don su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach lo ((nang xa) OR (dang xay)) hoi. hieu qua ((cam tuc) OR (nam thuc)) ban hanh don su tien.
• Adding a wildcard symbol may retrieve word variants: so sach lo ((nang xa) or (dang xay)) hoi. hieu qua ((cam tuc) or (nam thuc)) ban hanh don su tien*.