Perhaps you should try some spelling variations:
persons delivered » persons deliver'd, sermons delivered, reasons delivered
defined elements » defining elements, prefixed elements, mixed elements
process defined » process define, prowess defined, processes defined
wet process » wet processing, set processor, agent process

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: (( _ persons delivered placenta ) OR ( wet process defined elements )).
• Adding a wildcard symbol may retrieve word variants: (( _ persons delivered placenta ) or ( wet process defined elements ))*.