Perhaps you should try some spelling variations:
"heir apparent" » "huir apparent", "her apparent", "weir apparent", "heir aparente", "heir apaparente", "heir apparental"
"heir aparentale" » "huir aparentale", "her aparentale", "weir aparentale", "heir aparente", "heir parental", "heir parentales", "heir aaparenteale", "heir aparentalale"
"heir apparently" » "huir apparently", "her apparently", "weir apparently", "heir aparentely", "heir apaparentely", "heir apparentally"
"heir parent" » "huir parent", "her parent", "weir parent", "heir aparente", "heir parental"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"heir apparent\") OR (((\"heir aparentale\") OR (\"heir apparently\"))))) OR (\"heir parent\"))~".
• Removing quotes may allow a broader search: (((( heir apparent ) OR ((( heir aparentale ) OR ( heir apparently ))))) OR ( heir parent ))~.
• Adding a wildcard symbol may retrieve word variants: (((("heir apparent") OR ((("heir aparentale") OR ("heir apparently"))))) OR ("heir parent"))*.