Perhaps you should try some spelling variations:
"coder coder propagation modelling problem" » "coder coder propagation modeling problem" (Expand search), "coder coder propagation model problem" (Expand search), "coder coder propagation models problem" (Expand search), "coder mode propagation modelling problem" (Expand search), "coder model propagation modelling problem" (Expand search), "coder modes propagation modelling problem" (Expand search), "coder coder propagation modelling problems" (Expand search), "coder coder propagation modeling problems" (Expand search), "coder coder propagation covering problem" (Expand search), "coder decoder propagation modelling problem" (Expand search), "code code propagation modelling problem" (Expand search), "decoder codec propagation modelling 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 propagation modelling problem") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder propagation modelling problem\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder propagation modelling problem ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder propagation modelling problem") OR ("api python python python programming"))*.