Perhaps you should try some spelling variations:
thong dong » thong duong, thuong dong, thong cong
thanh phan » thanh pho, thanh san, thanh toan
hieu lang » chieu sang, hieu quang, nhieu tang
tranh cua » doanh cua, manh cua
cua thong » cua thuong, cua khong, cua tong
thanh van » thanh san, thanh toan, thanh nhan
doc hieu » toc thieu, hoc thieu, hoc hien

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu lang - canh tranh cua thong thong dong ((thanh van) or (thanh phan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - canh tranh cua thong thong dong ((thanh van) OR (thanh phan)).
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - canh tranh cua thong thong dong ((thanh van) or (thanh phan))*.