Perhaps you should try some spelling variations:
"in python python python programming" » "in pythons python python programming" (Expand search), "in piton python python programming" (Expand search), "in pitons python python programming" (Expand search), "_ python python python programming" (Expand search)
"coder coder step frequency coupling" » "coder decoder step frequency coupling" (Expand search), "code code step frequency coupling" (Expand search), "decoder codec step frequency coupling" (Expand search), "coder over step frequency coupling" (Expand search), "coder under step frequency coupling" (Expand search), "coder coder step frequencia coupling" (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 step frequency coupling") OR ("in python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder step frequency coupling\") OR (\"in python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder step frequency coupling ) OR ( in python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder step frequency coupling") OR ("in python python python programming"))*.