Perhaps you should try some spelling variations:
"coder coder counting optical problem" » "coder coder using optical problem" (Expand search), "coder coder during optical problem" (Expand search), "coder coder guiding optical problem" (Expand search), "coder coder counting optimal problem" (Expand search), "coder coder counting optical probe" (Expand search), "coder coder counting optical probes" (Expand search), "coder power counting optical problem" (Expand search), "coder model counting optical problem" (Expand search), "coder body counting optical problem" (Expand search), "coder decoder counting optical problem" (Expand search), "code code counting optical problem" (Expand search), "decoder codec counting optical problem" (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 counting optical problem") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder counting optical problem\") OR (\"on python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder counting optical problem ) OR ( on python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder counting optical problem") OR ("on python python python programming"))*.