Perhaps you should try some spelling variations:
"coder coder hotelling location problems" » "coder coder modelling location problems" (Expand search), "coder coder modelling lactation problems" (Expand search), "coder coder covering location problems" (Expand search), "coder coder hotelling location problem" (Expand search), "coder coder hotelling allocation problem" (Expand search), "coder decoder hotelling location problems" (Expand search), "code code hotelling location problems" (Expand search), "decoder codec hotelling location problems" (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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder hotelling location problems\") OR (\"api pythons python python programming\"))~".
• Removing quotes may allow a broader search: (( coder coder hotelling location problems ) OR ( api pythons python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder coder hotelling location problems") OR ("api pythons python python programming"))*.