Perhaps you should try some spelling variations:
perceptions python » perceptions psycho (Expand search), perceptions on (Expand search), perceptions to (Expand search)
model perceptions » local perceptions (Expand search), social perceptions (Expand search), maternal perceptions (Expand search)
python codigo » python coding (Expand search), python code (Expand search)
coder python » compra python (Expand search)
using model » ising model (Expand search), using modis (Expand search), using mobile (Expand search)

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: (( coder python codigo python programming ) OR ( using model perceptions python programming ))~.