Perhaps you should try some spelling variations:
regional tang » regional tax, regional trading, regional change
dong sind » dong sin, dong bin, dong ping
tang tang » taizong tang
tang dang » wang dan
wan yan » wang yan, nan yan, wai yan
ya a » a a, ye a, yu a
y a » y la
hai » hadi, haji, hari

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

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