Perhaps you should try some spelling variations:
"coder coder photon routing problem" » "coder coder photon counting problem" (Expand search), "coder coder photon using problem" (Expand search), "coder coder photon cooling problem" (Expand search), "coder one photon routing problem" (Expand search), "coder or photon routing problem" (Expand search), "coder over photo routing problem" (Expand search), "coder decoder photon routing problem" (Expand search), "code code photon routing problem" (Expand search), "decoder codec photon routing problem" (Expand search)
"api python python python programming" » "api pythons python python programming" (Expand search), "api piton python python programming" (Expand search), "api pitons python python programming" (Expand search), "rpa python 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 photon routing problem") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder photon routing problem\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder photon routing problem ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder photon routing problem") OR ("api python python python programming"))*.