Perhaps you should try some spelling variations:
regional tang » regional tax, regional trading, regional change
tang shang » tang zheng, tang shiping
dong sign » dong sin, among sign, dong bin
tang tang » taizong tang
shang hai » shang kai, dang hai, chang ha
dong di » dong sin
ya a » a a, y a, ye a
wang » wing, wan

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((wang or lang) yan) or (((dong di) or (dong sign)))) ya a regional tang tang shang hai ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((wang OR lang) yan) OR (((dong di) OR (dong sign)))) ya a regional tang tang shang hai ;.
• Adding a wildcard symbol may retrieve word variants: (((wang or lang) yan) or (((dong di) or (dong sign)))) ya a regional tang tang shang hai ;*.