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 sach » so sanh, bo sach, co sach
sach ly » sach y, sach lo, sach ty
nang xa » nang x, lang xa, nang ma
don su » dong su, down su, dan su
kien » bien, vien, tien

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. hieu qua ((cam xuc) or (nam thuc)) ban thanh don su kien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ly ((nang xa) OR (dang xay)) hoi. hieu qua ((cam xuc) OR (nam thuc)) ban thanh don su kien.
• Adding a wildcard symbol may retrieve word variants: so sach ly ((nang xa) or (dang xay)) hoi. hieu qua ((cam xuc) or (nam thuc)) ban thanh don su kien*.