Perhaps you should try some spelling variations:
"coder coder optical nonlinear programming" » "coder coder optical linear programming" (Expand search), "coder coder optical nonlinearity programming" (Expand search), "coder coder pratical nonlinear programming" (Expand search), "coder coder practical nonlinear programming" (Expand search), "coder code optical nonlinear programming" (Expand search), "coder order optical nonlinear programming" (Expand search), "coder mode optical nonlinear programming" (Expand search), "coder decoder optical nonlinear programming" (Expand search), "code code optical nonlinear programming" (Expand search), "decoder codec optical nonlinear programming" (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 coder optical nonlinear programming") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder optical nonlinear programming\") OR (\"on python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder optical nonlinear programming ) OR ( on python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder optical nonlinear programming") OR ("on python python python programming"))*.