Perhaps you should try some spelling variations:
"coder coder drone routing problem" » "coder coder re routing problem" (Expand search), "coder decoder drone routing problem" (Expand search), "code code drone routing problem" (Expand search), "decoder codec drone 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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder drone routing problem\") OR (\"api python python python programming\"))~".
• Removing quotes may allow a broader search: (( coder coder drone routing problem ) OR ( api python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder coder drone routing problem") OR ("api python python python programming"))*.