Perhaps you should try some spelling variations:
thanh trong » thanh trung, tranh trong, hanh trong
trong quan » thong quan, tong quan, thong quang
hieu lang » chieu sang, hieu quang, nhieu tang
quan dong » quang dong, quan long, quan hoang
khanh son » thanh son, nhanh song, thanh san
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 - thanh trong quan dong ((khanh son) or (khach hang)) phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - thanh trong quan dong ((khanh son) OR (khach hang)) phan tu.
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - thanh trong quan dong ((khanh son) or (khach hang)) phan tu*.