Perhaps you should try some spelling variations:
"coder model complexity theory problem" » "coder code complexity theory problem" (Expand search), "coder social complexity theory problem" (Expand search), "coder and complexity theory problem" (Expand search), "coder model complexity theory problems" (Expand search), "coder model complexity the problem" (Expand search), "coder model complexity theory program" (Expand search), "cover model complexity theory problem" (Expand search), "decoder model complexity theory problem" (Expand search), "copper model complexity theory 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 model complexity theory problem\") OR (\"api python python python programming\"))~".
• Removing quotes may allow a broader search: (( coder model complexity theory problem ) OR ( api python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder model complexity theory problem") OR ("api python python python programming"))*.