Perhaps you should try some spelling variations:
"heir apparent" » "huir apparent", "her apparent", "heir aparente", "heir apaparente", "heir apparental"
"heir apparently" » "huir apparently", "her apparently", "heir aparentely", "heir apaparentely", "heir apparentally"
"heir aparentes" » "huir aparentes", "her aparentes", "heir aparente", "heir patentes", "heir parente", "heir aaparentees", "heir aparentales"
"heim parent" » "him parent", "heim aparente", "heim 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 aparentes"))) OR ("heim parent"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"heir apparent\") OR (\"heir apparently\"))) OR (\"heir aparentes\"))) OR (\"heim parent\"))*".
• Removing quotes may allow a broader search: (((((( heir apparent ) OR ( heir apparently ))) OR ( heir aparentes ))) OR ( heim parent ))*.