Perhaps you should try some spelling variations:
"coder coding decoding cognitive radio" » "coder coding reading cognitive radio" (Expand search), "coder coding securing cognitive radio" (Expand search), "coder coding developing cognitive radio" (Expand search), "coder encoding decoding cognitive radio" (Expand search), "coder reading decoding cognitive radio" (Expand search), "coder joint decoding cognitive radio" (Expand search), "modern coding decoding cognitive radio" (Expand search), "color coding decoding cognitive radio" (Expand search), "odor coding decoding cognitive radio" (Expand search)
"api python python python programming" » "api pythons python python programming" (Expand search), "api piton python python programming" (Expand search), "api pitons python python programming" (Expand search), "rpa python python python programming" (Expand search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coding decoding cognitive radio\") OR (\"api python python python programming\"))~".
• Removing quotes may allow a broader search: (( coder coding decoding cognitive radio ) OR ( api python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder coding decoding cognitive radio") OR ("api python python python programming"))*.