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