Perhaps you should try some spelling variations:
"heir apparent" » "her apparent", "weir apparent", "hair apparent", "heir apparently", "heir apparental"
"heir parent" » "her parent", "weir parent", "hair parent", "heir parental"
"huir apparental" » "huir apparentlyal", "huir parental", "huir apparently", "huir aparentan", "huir apparentalal"
"huir aparente" » "huir aparece", "huir aparentale"

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 ((("huir apparental") OR ("huir aparente"))))) OR ("heir parent"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"heir apparent\") OR (((\"huir apparental\") OR (\"huir aparente\"))))) OR (\"heir parent\"))*".
• Removing quotes may allow a broader search: (((( heir apparent ) OR ((( huir apparental ) OR ( huir aparente ))))) OR ( heir parent ))*.