Perhaps you should try some spelling variations:
"autoregressive with endogenous input" » "autoregressive with endogenous conduct", "autoregressive with endogenous inducer", "autoregressive with endogenous annual"
"autoregressive with exogenous input" » "autoregressive with exogenous impacts", "autoregressive with exogenous insulin", "autoregressive with exogenous income"
"autoregressive with exogenous inputs" » "autoregressive with exogenous impactss", "autoregressive with exogenous insulins", "autoregressive with exogenous incomes"

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: (((("autoregressive with exogenous input") OR ("autoregressive with exogenous inputs"))) OR ("autoregressive with endogenous input")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"autoregressive with exogenous input\") OR (\"autoregressive with exogenous inputs\"))) or (\"autoregressive with endogenous input\"))".
• Removing quotes may allow a broader search: (((( autoregressive with exogenous input ) OR ( autoregressive with exogenous inputs ))) or ( autoregressive with endogenous input )).
• Adding a wildcard symbol may retrieve word variants: (((("autoregressive with exogenous input") OR ("autoregressive with exogenous inputs"))) or ("autoregressive with endogenous input"))*.