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