Perhaps you should try some spelling variations:
"heir apparent" » "huir apparent", "her apparent", "heir apparently", "heir aparente", "heir apaparente", "heir apparental"
"heir aparentes" » "huir aparentes", "her aparentes", "heir aparente", "heir patentes", "heir parente", "heir aaparentees", "heir aparentales"
"heim parent" » "heim aparente", "heim parental"
"him parent" » "him aparente", "him 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 aparentes"))) OR ((("heim parent") OR ("him parent"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"heir apparent\") OR (\"heir aparentes\"))) OR (((\"heim parent\") OR (\"him parent\"))))*".
• Removing quotes may allow a broader search: (((( heir apparent ) OR ( heir aparentes ))) OR ((( heim parent ) OR ( him parent ))))*.