Perhaps you should try some spelling variations:
"coder coder herding optimization problem" » "coder coder learning optimization problem" (Expand search), "coder coder using optimization problem" (Expand search), "coder coder routing optimization problem" (Expand search), "coder coder herding optimization problems" (Expand search), "coder code merging optimization problem" (Expand search), "coder cow herding optimization problem" (Expand search), "coder decoder herding optimization problem" (Expand search), "code code herding optimization problem" (Expand search), "decoder codec herding optimization 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 herding optimization problem") OR ("_ python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder herding optimization problem\") OR (\"_ python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder herding optimization problem ) OR ( _ python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder herding optimization problem") OR ("_ python python python programming"))*.