Perhaps you should try some spelling variations:
"heir apparent" » "huir apparent", "her apparent", "hair apparent", "heir apparently", "heir aparente", "heir apaparente", "heir apparental"
"heir apaparente" » "huir apaparente", "her apaparente", "hair apaparente", "heir aparente", "heir apaaparentee", "heir apaparentale"
"weir apparent" » "weir apparently", "weir aparente", "weis apparent", "wei apparent", "weil apparent", "weir apaparente", "weir apparental"
"weir parent" » "weis parent", "wei parent", "weil parent", "weir aparente", "weir 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 apaparente"))) OR ((("weir apparent") OR ("weir parent"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"heir apparent\") OR (\"heir apaparente\"))) OR (((\"weir apparent\") OR (\"weir parent\"))))".
• Removing quotes may allow a broader search: (((( heir apparent ) OR ( heir apaparente ))) OR ((( weir apparent ) OR ( weir parent )))).
• Adding a wildcard symbol may retrieve word variants: (((("heir apparent") OR ("heir apaparente"))) OR ((("weir apparent") OR ("weir parent"))))*.