Perhaps you should try some spelling variations:
"coder estimation _ precoder program" » "model estimation _ precoder program" (Expand search), "power estimation _ precoder program" (Expand search), "color estimation _ precoder program" (Expand search), "coder estimation _ proder program" (Expand search), "coder estimation _ recovery program" (Expand search), "coder estimation _ precoce programa" (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 estimation _ precoder program") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder estimation _ precoder program\") OR (\"on python python python programming\"))*".
• Removing quotes may allow a broader search: (( coder estimation _ precoder program ) OR ( on python python python programming ))*.