Perhaps you should try some spelling variations:
"coder coder teaching mark variogram" » "coder code teaching mark variogram" (Expand search), "coder poder teaching mark variogram" (Expand search), "coder model teaching mark variogram" (Expand search), "coder coder teaching math variogram" (Expand search), "coder coder teaching maps variogram" (Expand search), "coder coder teaching mato variogram" (Expand search), "coder decoder teaching mark variogram" (Expand search), "code code teaching mark variogram" (Expand search), "decoder codec teaching mark variogram" (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 teaching mark variogram") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder teaching mark variogram\") OR (\"on python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder teaching mark variogram ) OR ( on python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder teaching mark variogram") OR ("on python python python programming"))*.