Perhaps you should try some spelling variations:
"song and moon letters" » "cong and moon letters", "dong and moon letters", "song and muon letters", "song and yoon letters", "song and soon letters"
"cung and moon letters" » "cung and muon letters", "cung and yoon letters", "cung and soon letters", "cong and moon letters", "dung and moon letters"
"sung and mon letters" » "dung and mon letters", "ung and mon letters", "hung and mon letters"

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: (((("song and moon letters") OR ("cung and moon letters"))) OR ("sung and mon letters"))~.
• Removing quotes may allow a broader search: (((( song and moon letters ) or ( cung and moon letters ))) or ( sung and mon letters ))~.
• Adding a wildcard symbol may retrieve word variants: (((("song and moon letters") or ("cung and moon letters"))) or ("sung and mon letters"))*.