Perhaps you should try some spelling variations:
"coder coder and frequency bands" » "coder coder and frequency and" (Expand search), "coder decoder and frequency bands" (Expand search), "code code and frequency bands" (Expand search), "decoder codec and frequency bands" (Expand search), "coder code and frequency bands" (Expand search), "coder codes and frequency bands" (Expand search), "coder poder and frequency bands" (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), "manim python python python programming" (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 and frequency bands") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder and frequency bands\") OR (\"api python python python programming\"))*".
• Removing quotes may allow a broader search: (( coder coder and frequency bands ) OR ( api python python python programming ))*.