To find studies specific to food availability in convenience stores in rural and/or tribal communities then these sets of keywords should help:
Keywords for food deserts:
"food desert" OR "food deserts"
Broader keywords for food banks:
"food bank" OR "food banks" OR "food pantry" OR "food pantries"
Keywords to get at food distribution logistics:
distribut* OR redistribute* OR "resource allocation" OR allocation OR "operations research" OR optimiz* OR optimal OR supply OR "supply chain" OR logistics OR efficien* OR effectiv* OR equit* OR "best practice" OR "best practices"
Other general keywords that could help you get at management issues:
strateg* OR target* OR manag* OR policy OR policies
Keywords for technology used in food distribution:
technology OR software OR "computer software"
Other keywords you might consider:
Search 1.
("food bank" OR "food banks" OR "food pantry" OR "food pantries")(strategies OR targeted OR logistics OR logistical OR distribute OR distribution OR redistribute OR redistribution OR efficiency OR efficient OR efficiencies OR effective OR effectiveness OR "resource allocation" OR allocation OR "operations research" OR management OR policy OR policies OR optimal OR optimal OR optimizing OR supply)
Search 2.
("food bank" OR "food banks" OR "food pantry" OR "food pantries")(technology OR software OR "computer software")