Perhaps you should try some spelling variations:
"coder optimization using placement problem" » "code optimization using placement problem" (Expand search), "modern optimization using placement problem" (Expand search), "powder optimization using placement problem" (Expand search), "coder optimization and placement problem" (Expand search), "coder optimization using management problem" (Expand search), "coder optimization using replacement problem" (Expand search), "coder optimization sling placement problem" (Expand search), "coder optimization using platelet 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 optimization using placement problem\") OR (\"api python python python programming\"))~".
• Removing quotes may allow a broader search: (( coder optimization using placement problem ) OR ( api python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder optimization using placement problem") OR ("api python python python programming"))*.