Perhaps you should try some spelling variations:
"coder coder based routing problem" » "coder coder based costing problem" (Expand search), "coder coder based coating problem" (Expand search), "coder coder based computing problem" (Expand search), "coder decoder based routing problem" (Expand search), "code code based routing problem" (Expand search), "decoder codec based routing problem" (Expand search), "coder code based routing problem" (Expand search), "coder foder based routing problem" (Expand search), "coder codec based routing problem" (Expand search)
"in python pythin python programming" » "in python python python programming" (Expand search), "in pythons python python programming" (Expand search), "in piton python python programming" (Expand search), "in python pythons python programming" (Expand search), "in python piton 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 based routing problem") OR ("in python pythin python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder based routing problem\") OR (\"in python pythin python programming\"))".
• Removing quotes may allow a broader search: (( coder coder based routing problem ) OR ( in python pythin python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder based routing problem") OR ("in python pythin python programming"))*.