Perhaps you should try some spelling variations:
"heir apparent" » "her apparent", "weir apparent", "herr apparent", "heir aparente", "heir parent"
"heir apparently" » "her apparently", "weir apparently", "herr apparently", "heir aparentely", "heir parently"
"hair apparent" » "hair aparente", "hair parent"
"huir apparent" » "huir aparente", "huir parent"

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