Perhaps you should try some spelling variations:
"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)
"coder coder to signal processing" » "coder decoder to signal processing" (Expand search), "code code to signal processing" (Expand search), "decoder codec to signal processing" (Expand search), "coder coder _ signal processing" (Expand search), "coder code to signal processing" (Expand search), "coder codes to signal processing" (Expand search), "coder codec to signal processing" (Expand search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("coder coder to signal processing") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder to signal processing\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder to signal processing ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder to signal processing") OR ("api python python python programming"))*.