Perhaps you should try some spelling variations:
"learning intelligent surveillance covert" » "learning intelligent surface covert", "using intelligent surveillance covert", "learning intelligent surveillance over", "learning intelligent surveillance camera", "learning intelligent surveillance cameras"
"designing intelligent surveillance court" » "designing intelligent surface court", "mining intelligent surveillance court", "developing intelligent surveillance court", "using intelligent surveillance court", "designing intelligent surveillance art", "designing intelligent surveillance control", "designing intelligent surveillance camera"
"decision intelligence surveillance covert" » "vision intelligent surveillance covert", "decision intelligence surveillance over", "decision intelligence surveillance camera", "decision intelligence surveillance cameras"

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: (((("learning intelligent surveillance covert") OR ("designing intelligent surveillance court"))) OR ("decision intelligence surveillance covert")).
• Removing quotes may allow a broader search: (((( learning intelligent surveillance covert ) or ( designing intelligent surveillance court ))) or ( decision intelligence surveillance covert )).
• Adding a wildcard symbol may retrieve word variants: (((("learning intelligent surveillance covert") or ("designing intelligent surveillance court"))) or ("decision intelligence surveillance covert"))*.