Perhaps you should try some spelling variations:
"heir apparent" » "her apparent", "weir apparent", "hair apparent", "heir aparente", "heir parent"
"heir apparently" » "her apparently", "weir apparently", "hair apparently", "heir aparentely", "heir parently", "heir apparental", "heir apparent", "heir apparente"
"heir parently" » "her parently", "weir parently", "hair parently", "heir parental", "heir parent", "heir parente"
"huir apparent" » "huir aparente", "huir parent"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"heir apparent\") OR (\"huir apparent\"))) OR (((\"heir apparently\") OR (\"heir parently\"))))~".
• Removing quotes may allow a broader search: (((( heir apparent ) OR ( huir apparent ))) OR ((( heir apparently ) OR ( heir parently ))))~.
• Adding a wildcard symbol may retrieve word variants: (((("heir apparent") OR ("huir apparent"))) OR ((("heir apparently") OR ("heir parently"))))*.