Perhaps you should try some spelling variations:
"coder precoder graph algorithms complexity" » "coder precoder graph algorithmic complexity" (Expand search), "coder precoder search algorithms complexity" (Expand search), "coder precoder and algorithms complexity" (Expand search), "coder decoder graph algorithms complexity" (Expand search)
"api pythons python python programming" » "api pitons python python programming" (Expand search), "api piton python python programming" (Expand search), "api pythons piton python programming" (Expand search), "api pythons pitons python programming" (Expand search), "api pythons pytm python programming" (Expand search), "api python python 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 precoder graph algorithms complexity") OR ("api pythons python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder precoder graph algorithms complexity\") OR (\"api pythons python python programming\"))".
• Removing quotes may allow a broader search: (( coder precoder graph algorithms complexity ) OR ( api pythons python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder precoder graph algorithms complexity") OR ("api pythons python python programming"))*.