https://www.google.ca/advanced_search
Use Google's "Advanced Search" feature to better control your searches.
- U.S. Government sites: add "site:" before the domain site:.gov site:.mx
- Exact word or phrase: enclose in quotes "bienestar social" "baja california"
- Exclude words: minus sign before the word -Zapatistas
You can also limit by language, region, date updated, etc.