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