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