Perhaps you should try some spelling variations:
variable functions » covariance functions (Expand search), variation functions (Expand search), measurable functions (Expand search)
coding variable » cooking variables (Expand search), loading variables (Expand search), voiding variables (Expand search)
python python » pythons python (Expand search), piton python (Expand search), pitons python (Expand search)
coder vector » under vector (Expand search), model vector (Expand search), order vector (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 vector coding variable functions ) OR ( in python python python programming ))~".
• Adding a wildcard symbol may retrieve word variants: (( coder vector coding variable functions ) OR ( in python python python programming ))*.