Perhaps you should try some spelling variations:
thong huong » thong thuong, thong duong, thong thong
hanh doanh » hang doanh, chinh doanh, doanh doanh
canh doanh » chinh doanh, doanh doanh, kinh doanh
hieu lang » chieu sang, hieu quang, nhieu tang
cua thong » cua thuong, cua khong, cua tong
doc hieu » toc thieu, hoc thieu, hoc hien
dan van » dang van, doan van, dao van

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - ((canh doanh) OR (hanh doanh)) cua thong huong dan van ban~.
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - ((canh doanh) or (hanh doanh)) cua thong huong dan van ban*.