Perhaps you should try some spelling variations:
state regulation » voltage regulation (Expand Search), gene regulation (Expand Search), self regulation (Expand Search)
media regulation » media education (Expand Search), gene regulation (Expand Search), self regulation (Expand Search)
state relations » states relations (Expand Search), strain relations (Expand Search), strait relations (Expand Search)
hole state » hole ststem (Expand Search), how state (Expand Search), idle state (Expand Search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( china–hole state relations) OR ( china–hole ((state regulation) OR (media regulation))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( china–hole state relations) OR ( china–hole ((state regulation) OR (media regulation))))".
• Adding a wildcard symbol may retrieve word variants: (( china–hole state relations) OR ( china–hole ((state regulation) OR (media regulation))))*.