Perhaps you should try some spelling variations:
"coder duration frequency precoder program" » "coder duration frequency recovery program" (Expand search), "coder duration frequency encoder program" (Expand search), "coder duration frequency procedure program" (Expand search), "coder duration frequency proder program" (Expand search), "coder duration frequency precoce programa" (Expand search), "power duration frequency precoder program" (Expand search), "order duration frequency precoder program" (Expand search), "longer duration frequency precoder program" (Expand search)
"on python python python programming" » "on pythons python python programming" (Expand search), "on piton python python programming" (Expand search), "on pitons python python programming" (Expand search), "in python pythin python programming" (Expand search), "of python pythof python programming" (Expand search), "_ python pyth_ 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 duration frequency precoder program") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder duration frequency precoder program\") OR (\"on python python python programming\"))*".
• Removing quotes may allow a broader search: (( coder duration frequency precoder program ) OR ( on python python python programming ))*.