Perhaps you should try some spelling variations:
variable probit » variable porosity (Expand search), bivariate probit (Expand search)
code variable » mode variable (Expand search), one variable (Expand search), more variable (Expand search)
python python » pythons python (Expand search), piton python (Expand search), pitons python (Expand search)
coder python » codigo python (Expand search), compra python (Expand search)
in python » _ python (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 python code variable probit ) OR ( in python python python programming ))~".
• Adding a wildcard symbol may retrieve word variants: (( coder python code variable probit ) OR ( in python python python programming ))*.