Perhaps you should try some spelling variations:
"heir apparent" » "huir apparent", "her apparent", "weir apparent", "heir aparente", "heir apaparente", "heir apparental"
"heir apparently" » "huir apparently", "her apparently", "weir apparently", "heir aparentely", "heir apaparentely", "heir apparentally"
"heir aparentely" » "huir aparentely", "her aparentely", "weir aparentely", "heir aparente", "heir aparentes", "heir aaparenteely", "heir aparentalely"
"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.

• Performing a fuzzy search may retrieve terms with similar spellings: (((((("heir apparent") OR ("heir apparently"))) OR ("heir aparentely"))) OR ("heir parent"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"heir apparent\") OR (\"heir apparently\"))) OR (\"heir aparentely\"))) OR (\"heir parent\"))*".
• Removing quotes may allow a broader search: (((((( heir apparent ) OR ( heir apparently ))) OR ( heir aparentely ))) OR ( heir parent ))*.