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