Perhaps you should try some spelling variations:
"heir apparent" » "huir apparent", "her apparent", "weir apparent", "heir apparently", "heir aparente"
"heir aparentely" » "huir aparentely", "her aparentely", "weir aparentely", "heir aparente", "heir apparently", "heir aparentes"
"heir parent" » "huir parent", "her parent", "weir parent"
"heir parental" » "huir parental", "her parental", "weir parental"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("heir apparent") OR ("heir aparentely"))) OR ((("heir parent") OR ("heir parental"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"heir apparent\") OR (\"heir aparentely\"))) OR (((\"heir parent\") OR (\"heir parental\"))))*".
• Removing quotes may allow a broader search: (((( heir apparent ) OR ( heir aparentely ))) OR ((( heir parent ) OR ( heir parental ))))*.