Perhaps you should try some spelling variations:
"linkage groups" » "linkage group", "link groups"
"life groups" » "life group", "line groups", "elite groups"
"like groups" » "little groups", "large groups", "crime groups"
"lie groups" » "live groups", "line groups"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("life groups") OR ((((("like groups") OR ("linkage groups"))) OR ("lie groups")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"life groups\") or (((((\"like groups\") OR (\"linkage groups\"))) or (\"lie groups\"))))".
• Removing quotes may allow a broader search: (( life groups ) or ((((( like groups ) OR ( linkage groups ))) or ( lie groups )))).
• Adding a wildcard symbol may retrieve word variants: (("life groups") or ((((("like groups") OR ("linkage groups"))) or ("lie groups"))))*.