Perhaps you should try some spelling variations:
"operations tangent" » "operators tangent", "operations target", "operations taken"
"operators range" » "operators tangent", "operating range", "operation range", "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 ((((("operations tangent") OR ("operations tangent"))) OR ("operators range")))).
• Removing quotes may allow a broader search: (( operator ranges ) or ((((( operations tangent ) or ( operations tangent ))) or ( operators range )))).
• Adding a wildcard symbol may retrieve word variants: (("operator ranges") or ((((("operations tangent") or ("operations tangent"))) or ("operators range"))))*.