Perhaps you should try some spelling variations:
"coder coder operator allocation problem" » "coder coder operator application problem" (Expand search), "coder coder generators allocation problem" (Expand search), "coder coder operation allocative problem" (Expand search), "coder coder operator location problem" (Expand search), "coder order operators allocation problem" (Expand search), "coder camera operator allocation problem" (Expand search), "coder boiler operator allocation problem" (Expand search), "coder decoder operator allocation problem" (Expand search), "code code operator allocation problem" (Expand search), "decoder codec operator allocation 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 operator allocation problem") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder operator allocation problem\") OR (\"api python python python programming\"))*".
• Removing quotes may allow a broader search: (( coder coder operator allocation problem ) OR ( api python python python programming ))*.