Perhaps you should try some spelling variations:
"Help:Pronunciation spelling key" » "Help:Pronunciation selling key", "Help:Pronunciation swelling key", "Help:Pronunciation speaking key"
"Help:Pronunciation sterling key" » "Help:Pronunciation starling key", "Help:Pronunciation berling key"
"Help:Pronunciation schelling key" » "Help:Pronunciation schooling key"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("Help:Pronunciation spelling key") OR ("Help:Pronunciation sterling key"))) OR ("Help:Pronunciation schelling key"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"Help:Pronunciation spelling key\") OR (\"Help:Pronunciation sterling key\"))) OR (\"Help:Pronunciation schelling key\"))".
• Removing quotes may allow a broader search: (((( Help:Pronunciation spelling key ) OR ( Help:Pronunciation sterling key ))) OR ( Help:Pronunciation schelling key )).
• Adding a wildcard symbol may retrieve word variants: (((("Help:Pronunciation spelling key") OR ("Help:Pronunciation sterling key"))) OR ("Help:Pronunciation schelling key"))*.