Perhaps you should try some spelling variations:
"variance optimization python python programming" » "surface optimization python python programming" (Expand search), "engine optimization python python programming" (Expand search), "value optimization python python programming" (Expand search), "variance optimization method python programming" (Expand search), "variance optimization option python programming" (Expand search), "variance optimization methods python programming" (Expand search), "variance optimization pythons python programming" (Expand search), "variance optimization piton python programming" (Expand search), "variance optimization pitons python programming" (Expand search)
"coder modulation coder decoder program" » "coded modulation coder decoder program" (Expand search), "code modulation coder decoder program" (Expand search), "power modulation coder decoder program" (Expand search), "coder modulation codes decoder program" (Expand search), "coder modulation code decoder program" (Expand search), "coder modulation model decoder program" (Expand search), "coder modulation coder decade program" (Expand search), "coder modulation coder decide program" (Expand search), "coder modulation coder leader program" (Expand search), "coder modulation encoder decoder program" (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 modulation coder decoder program") OR ("variance optimization python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder modulation coder decoder program\") OR (\"variance optimization python python programming\"))".
• Removing quotes may allow a broader search: (( coder modulation coder decoder program ) OR ( variance optimization python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder modulation coder decoder program") OR ("variance optimization python python programming"))*.