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"
"heir parent" » "huir parent", "her parent", "heir aparente", "heir parental"
"heim apparent" » "heim apparently", "heim aparente", "him apparent", "heim apaparente", "heim apparental"

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