You can go to Google and do a restricted search on the wikitree site that includes all types of pages here and can include quotation marks. I have my Google search preferences to return 100 results, which makes it easier to skim the list and skip over results that don't interest me. The search string to enter in the regular Google search box should be something like these:
site:wikitree.com "burned over district"
site:wikitree.com "second great awakening"
I added "second great awakening" because this G2G is the only result I got for "burned over district."