Perhaps you should try some spelling variations:
"sun and moon letters" » "sun and own letters", "sun and town letters", "sun and modern letters"
"sun and john letters" » "sun and own letters", "sun and john peters", "sun and john lester", "sun and john lesters", "sun and john potters", "sun and john levers"
"sun and john letter" » "sun and john lester", "sun and john potter", "sun and john lever"

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: (("sun and moon letters") OR ((("sun and john letters") OR ("sun and john letter")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"sun and moon letters\") or (((\"sun and john letters\") OR (\"sun and john letter\"))))".
• Removing quotes may allow a broader search: (( sun and moon letters ) or ((( sun and john letters ) OR ( sun and john letter )))).
• Adding a wildcard symbol may retrieve word variants: (("sun and moon letters") or ((("sun and john letters") OR ("sun and john letter"))))*.