Perhaps you should try some spelling variations:
thien hieu » thien nhien, thien chien, thien hue
hanh doanh » hang doanh, chinh doanh, doanh doanh
khong cang » hong bang, khong dung, thong cung
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
doanh cua » doanh luan
tran van » luan van
van tap » van tai, van tan, han tap

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: thien hieu lang - hanh doanh cua ((khong cang) OR (thong cong)) tran van tap~.
• Adding a wildcard symbol may retrieve word variants: thien hieu lang - hanh doanh cua ((khong cang) or (thong cong)) tran van tap*.