Perhaps you should try some spelling variations:
"master–slave mortality" » "master–clave mortality", "master–llave mortality", "master–save mortality"
"master–slave modality" » "master–clave modality", "master–llave modality", "master–save modality", "master–slave mobility"
"master–slave immortality" » "master–clave immortality", "master–llave immortality", "master–save immortality"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("master–slave mortality") OR ("master–slave modality"))) OR ("master–slave immortality"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"master–slave mortality\") OR (\"master–slave modality\"))) OR (\"master–slave immortality\"))".
• Removing quotes may allow a broader search: (((( master–slave mortality ) OR ( master–slave modality ))) OR ( master–slave immortality )).
• Adding a wildcard symbol may retrieve word variants: (((("master–slave mortality") OR ("master–slave modality"))) OR ("master–slave immortality"))*.