I thought it might be worth going through some of the grocery stores in the Mt View-Cupertino area which specialize in particular cuisines.
For Chinese (and a bit pan-Asian, including Filipino), the 99 Ranch chain is the largest. There is one in Mt View: http://www.yelp.com/biz/99-ranch-market-mountain-view-2, there is also Japanese grocery store (Nijiya) in easy walking distance, that has lots of prepared food as well: http://www.yelp.com/biz/nijiya-market-mountain-view
However, if you want to go a little bit further south, there is a very large complex of mostly Chinese shops, including another 99 Ranch down in Cupertino, in Cupertino Village: http://www.cupertino.org/index.aspx?page=781
If you want a larger Japanese grocery, tea shops, sushi shop, ramen shop, gyoza shop, Japanese bookstore, Japanese bakery, and Daiso, then you can try this place in northern San Jose:
If you want a Korean strip mall, with grocery store, home goods stores, food court, etc, then on El Camino, just after the Lawrence Expressway, there is this place: http://www.yelp.com/biz/lawrence-plaza-food-court-santa-clara-2
Although, for just groceries (and a fancy Korean BBQ place next to it), just a little bit before on the other side of the road there is also the very large Hankook Market: http://www.yelp.com/biz/hankook-supermarket-sunnyvale
For South Asian, probably the most fully stocked (with nearby businesses like a sweet shop, ice cream shop, sari store, etc.) this is probably your best bet: http://www.yelp.com/biz/india-cash-and-carry-sunnyvale
A little bit up the street is a similarly named, but quite a bit tidier and more low key Indian place: http://www.yelp.com/biz/bombay-cash-and-carry-sunnyvale
For Persian groceries and halal meats (and prepared foods), there is this the Rose Market. You get your kebabs from literally a hole in the wall:
For a more Arabic halal market, this place is decent:
There’s also an awesome Pakistani restaurant right next to it, which is a bit like a nicer version of Naan-N-Curry. It’s worth visiting not only for the food, but also the giant portrait of Dumbledore.
Happy shopping (and eating!)