Perhaps you should try some spelling variations:
formal teaching » formal training, formal teacher
china formal » china formed, asia formal, china burma
tuan china » wuhan china, can china, taiwan china
aids gong » aids among
dong liu » dong bin, dong xu, song li
gong hui » tong hui, tong shui, wang hui

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((dong liu) or (dong sin))) or (dong di)) tuan china formal teaching aids gong hui ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((dong liu) OR (dong sin))) OR (dong di)) tuan china formal teaching aids gong hui ;.
• Adding a wildcard symbol may retrieve word variants: ((((dong liu) or (dong sin))) or (dong di)) tuan china formal teaching aids gong hui ;*.