Perhaps you should try some spelling variations:
"humanistic coefficients" » "elastic coefficients", "deterministic coefficients", "humanistic efficients"
"ballistic coefficients" » "elliptic coefficients", "elastic coefficients", "allometric coefficients", "ballistic 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 ("ballistic coefficients")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"humanistic coefficient\") or (((\"humanistic coefficients\") OR (\"ballistic coefficients\"))))".
• Removing quotes may allow a broader search: (( humanistic coefficient ) or ((( humanistic coefficients ) OR ( ballistic coefficients )))).
• Adding a wildcard symbol may retrieve word variants: (("humanistic coefficient") or ((("humanistic coefficients") OR ("ballistic coefficients"))))*.