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