Perhaps you should try some spelling variations:
"heir apparent" » "huir apparent", "her apparent", "weir apparent", "heir apparently", "heir aparente", "heir apaparente", "heir apparental"
"heir apparentlyal" » "huir apparentlyal", "her apparentlyal", "weir apparentlyal", "heir apparentlylyal", "heir aparentelyal", "heir apparently", "heir apaparentelyal", "heir apparentallyal"
"heir aparentely" » "huir aparentely", "her aparentely", "weir aparentely", "heir aparente", "heir apparently", "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.

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