You can search multiple keywords with something like this:
label:robotics + label:machine_learning
in the author search. But I don't know a way to narrow by country.
If you're really interested, you might be able to do some coding to get what you're after. Perhaps something like this:
http://biostat.jhsph.edu/~jleek/code/googleCite.r
or you can modify some of the code in the scholar package in R.
Here's a related question pertaining to narrowing country on Google Scholar:
Google Scholar: how to exclude some countries from the search?