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

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