Perhaps you should try some spelling variations:
"coder coder book visual processing" » "coder coder book signal processing" (Expand search), "coder coder book minimal processing" (Expand search), "coder coder book digital processing" (Expand search), "coder decoder book visual processing" (Expand search), "code code book visual processing" (Expand search), "decoder codec book visual processing" (Expand search), "coder cover book visual processing" (Expand search), "coder order book visual processing" (Expand search), "coder codire ebook visual processing" (Expand search)
"_ python python python programming" » "_ pythons python python programming" (Expand search), "_ piton python python programming" (Expand search), "_ pitons 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 book visual processing") OR ("_ python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder book visual processing\") OR (\"_ python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder book visual processing ) OR ( _ python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder book visual processing") OR ("_ python python python programming"))*.