Perhaps you should try some spelling variations:
"operations tangent" » "operations target", "operations taken", "operations taught"
"operators tangent" » "operators recent", "operators moment", "operators table", "operations tangent"
"operators range" » "operating range", "operation range", "operators rough", "operations range"
"operator ranges" » "operation ranges"

Try widening your search to All Fields.

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: (("operator ranges") OR ((((("operators tangent") OR ("operations tangent"))) OR ("operators range")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"operator ranges\") or (((((\"operators tangent\") OR (\"operations tangent\"))) or (\"operators range\"))))".
• Removing quotes may allow a broader search: (( operator ranges ) or ((((( operators tangent ) OR ( operations tangent ))) or ( operators range )))).
• Adding a wildcard symbol may retrieve word variants: (("operator ranges") or ((((("operators tangent") OR ("operations tangent"))) or ("operators range"))))*.