Perhaps you should try some spelling variations:
"coder coder in challenging problem" » "coder coder in charging problem" (Expand search), "coder coder in chattering problem" (Expand search), "coder coder in challenging proposal" (Expand search), "coder coder _ challenging problem" (Expand search), "coder coder the challenging problem" (Expand search), "coder coder in changing problem" (Expand search), "coder decoder in challenging problem" (Expand search), "code code in challenging problem" (Expand search), "decoder codec in challenging problem" (Expand search), "coder code in challenging problem" (Expand search), "coder codes in challenging problem" (Expand search), "coder poder in challenging 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 in challenging problem\") OR (\"api python python python programming\"))~".
• Removing quotes may allow a broader search: (( coder coder in challenging problem ) OR ( api python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder coder in challenging problem") OR ("api python python python programming"))*.