Use a variety of different terms and combine with OR. Use AND to connect your country of choice. Use NOT to exclude any terms that seem to be throwing off your search.
Example:
("food desert" OR "food shortage" OR "hunger" OR "food scarcity") AND Ecuador NOT "hunger strike"
The more you add to the string, the fewer results. Sometimes, it can narrow the search too much. An example search string that may or may not bring back results, would be:
historical shifts" OR "historical changes" OR shift* OR change*) AND ("food desert" OR "food shortage" OR "hunger" OR "food scarcity") AND Ecuador NOT "hunger strike"
