Perhaps you should try some spelling variations:
regulatory relations » regulatory regions, regular relations, regulatory functions
regulatory setting » regulatory reporting, regulatory situation
cycle regulatory » cycle regulation, gene regulatory

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( cycle regulatory relations ) OR ( acute ((regulatory setting) OR (ambulatory setting)) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( cycle regulatory relations ) or ( acute ((regulatory setting) OR (ambulatory setting)) ))".
• Adding a wildcard symbol may retrieve word variants: (( cycle regulatory relations ) or ( acute ((regulatory setting) OR (ambulatory setting)) ))*.