Perhaps you should try some spelling variations:
"coder coder _ clustering and" » "coder coder _ clustering of" (Expand search), "coder decoder _ clustering and" (Expand search), "code code _ clustering and" (Expand search), "decoder codec _ clustering and" (Expand search)
"on python python python programming" » "on pythons python python programming" (Expand search), "on piton python python programming" (Expand search), "on pitons python python programming" (Expand search), "in python pythin python programming" (Expand search), "of python pythof python programming" (Expand search), "_ python pyth_ 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 _ clustering and") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder _ clustering and\") OR (\"on python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder _ clustering and ) OR ( on python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder _ clustering and") OR ("on python python python programming"))*.