Perhaps you should try some spelling variations:
"calculus in python python programming" » "calculus in pythons python programming" (Expand search), "calculus in piton python programming" (Expand search), "calculus in pitons python programming" (Expand search), "calculus of python python programming" (Expand search), "calculus _ python python programming" (Expand search)
"coder coding using java computer" » "modern coding using java computer" (Expand search), "color coding using java computer" (Expand search), "odor coding using java computer" (Expand search), "coder modeling using java computer" (Expand search), "coder drying using java computer" (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 coding using java computer\") OR (\"calculus in python python programming\"))~".
• Removing quotes may allow a broader search: (( coder coding using java computer ) OR ( calculus in python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder coding using java computer") OR ("calculus in python python programming"))*.