Perhaps you should try some spelling variations:
he conversations » e conversations, have conversations, one conversations
christians he » christians have, christians held, christians home
reef history » brief history, reeves history, reef fishery
17th century » 19th century, 20th century
12 germany » 11 germany, 12 german, 2 germany

Try widening your search to All Fields.

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: %christians he conversations %12 germany %reef history %2023 ((17th century) OR (18th century))%22.
• Adding a wildcard symbol may retrieve word variants: %christians he conversations %12 germany %reef history %2023 ((17th century) or (18th century))%22*.