Perhaps you should try some spelling variations:
"lethal injection" » "lethal infection", "ethanol injection", "local injection"
"metal injection" » "metal interaction", "cell injection", "well injection"
"metal detection" » "metal detector", "seal detection", "method 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 ("metal injection"))) OR ("metal detection")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"lethal injection\") OR (\"metal injection\"))) or (\"metal detection\"))".
• Removing quotes may allow a broader search: (((( lethal injection ) OR ( metal injection ))) or ( metal detection )).
• Adding a wildcard symbol may retrieve word variants: (((("lethal injection") OR ("metal injection"))) or ("metal detection"))*.