Perhaps you should try some spelling variations:
"connectivity relations" » "connectivity solutions", "connectivity options", "connectivity restoration"
"connectivity reduction" » "connectivity introduction", "connectivity restoration", "connectivity simulation"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"connectivity relations\") OR (\"connectivity reduction\"))*".
• Removing quotes may allow a broader search: (( connectivity relations ) OR ( connectivity reduction ))*.