Perhaps you should try some spelling variations:
"lethal injection" » "lethal infection", "ethanol injection", "lethal interactions"
"local infections" » "local injections", "oral infections", "local interactions"
"local injection" » "local injections", "coal injection", "local interaction"
"metal injection" » "metal interaction", "cell injection", "metal detection"

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: (((("lethal injection") OR ((("local injection") OR ("local infections"))))) OR ("metal injection")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"lethal injection\") or (((\"local injection\") OR (\"local infections\"))))) or (\"metal injection\"))".
• Removing quotes may allow a broader search: (((( lethal injection ) or ((( local injection ) OR ( local infections ))))) or ( metal injection )).
• Adding a wildcard symbol may retrieve word variants: (((("lethal injection") or ((("local injection") OR ("local infections"))))) or ("metal injection"))*.