Perhaps you should try some spelling variations:
"coder coder optimed protocol problem" » "coder coder optimized protocol problem" (Expand search), "coder coder time protocol problem" (Expand search), "coder coder optimize protocols problem" (Expand search), "coder coder optimed protocols problems" (Expand search), "coder coder optimed protocol program" (Expand search), "coder coder optimed protocol proposed" (Expand search), "coder decoder optimized protocol problem" (Expand search), "coder decoder optimed protocol problem" (Expand search), "code code optimed protocol problem" (Expand search), "decoder codec optimed protocol problem" (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 optimed protocol problem") OR ("_ python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder optimed protocol problem\") OR (\"_ python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder optimed protocol problem ) OR ( _ python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder optimed protocol problem") OR ("_ python python python programming"))*.