Perhaps you should try some spelling variations:
"heir apparent" » "her apparent", "heir aparente", "heir apparente", "heir apparents", "heir apaparente"
"heir apparently" » "her apparently", "heir aparentely", "heir apparentely", "heir apparentsly", "heir apaparentely"
"hair apparental" » "hair aparenteal", "fair apparental", "air apparental", "nair apparental", "hair parental", "hair aparentan", "hair apparenteal", "hair apparentsal", "hair apaparenteal"
"huir parent" » "huir parente", "huir parents", "huir aparente"

You may be able to get more results by adjusting your search query.

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