Perhaps you should try some spelling variations:
"humanistic coefficients" » "ballistic coefficients", "deterministic coefficients", "humanistic efficients"
"elastic coefficients" » "elliptic coefficients", "elasticity coefficient", "ballistic coefficients", "elastic efficients"
"humanistic coefficient" » "humanistic efficient"

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: (("humanistic coefficient") OR ((("humanistic coefficients") OR ("elastic coefficients")))).
• Removing quotes may allow a broader search: (( humanistic coefficient ) or ((( humanistic coefficients ) or ( elastic coefficients )))).
• Adding a wildcard symbol may retrieve word variants: (("humanistic coefficient") or ((("humanistic coefficients") or ("elastic coefficients"))))*.