Perhaps you should try some spelling variations:
"heir apparent" » "huir apparent", "her apparent", "hair apparent", "heir apparently", "heir aparente"
"heir aparentalely" » "huir aparentalely", "her aparentalely", "hair aparentalely", "heir parentales"
"heir parent" » "huir parent", "her parent", "hair parent"
"weir parent" » "weis parent", "wei parent", "weil parent"

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 aparentalely\"))) OR (((\"heir parent\") OR (\"weir parent\"))))~".
• Removing quotes may allow a broader search: (((( heir apparent ) OR ( heir aparentalely ))) OR ((( heir parent ) OR ( weir parent ))))~.
• Adding a wildcard symbol may retrieve word variants: (((("heir apparent") OR ("heir aparentalely"))) OR ((("heir parent") OR ("weir parent"))))*.