Perhaps you should try some spelling variations:
"heir apparent" » "huir apparent", "her apparent", "heim apparent", "heir apparently", "heir apparental"
"heir aparentes" » "huir aparentes", "her aparentes", "heim aparentes", "heir patentes", "heir parente", "heir parents", "heir aparentales", "heir apareces"
"heir parent" » "huir parent", "her parent", "heim parent", "heir parental"
"heir aparente" » "huir aparente", "her aparente", "heim aparente", "heir aparentale", "heir aparece"

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 parent") OR ("heir aparente"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"heir apparent\") OR (\"heir aparentes\"))) OR (((\"heir parent\") OR (\"heir aparente\"))))*".
• Removing quotes may allow a broader search: (((( heir apparent ) OR ( heir aparentes ))) OR ((( heir parent ) OR ( heir aparente ))))*.