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 vas signal processing" » "coder decoder vas signal processing" (Expand search), "code code vas signal processing" (Expand search), "decoder codec vas signal processing" (Expand search), "coder coder sbas signal processing" (Expand search), "coder coder gps signal processing" (Expand search), "coder coder am signal processing" (Expand search), "coder poder vai 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 vas signal processing") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder vas signal processing\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder vas signal processing ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder vas signal processing") OR ("api python python python programming"))*.