Perhaps you should try some spelling variations:
"comicas mathematics computer programming." » "comicas mathematics computer programs.", "comicas mathematics computer program.", "comicas matematicas computer programming.", "copulas mathematical computer programming.", "sciences mathematics computer programming."
"basicas matematicas web programming." » "comicas matematicas web programming.", "benditas matematicas web programming.", "fisica matematica web programming.", "basicas matematicas en programming.", "basicas matematicas de programming.", "basicas matematicas e programming.", "basicas matematicas web programacion."

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("comicas mathematics computer programming.") or ("basicas matematicas web programming."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("comicas mathematics computer programming.") OR ("basicas matematicas web programming.")).
• Removing quotes may allow a broader search: (( comicas mathematics computer programming. ) or ( basicas matematicas web programming. )).
• Adding a wildcard symbol may retrieve word variants: (("comicas mathematics computer programming.") or ("basicas matematicas web programming."))*.