#1: Use double quotes to search for a phrase. Keep the words together in that order!
"Japanese internment"
"World War II"
"Merced Assembly Center"
#2: Join similar concepts with OR.
"Merced assembly center" OR "Merced detention center" OR "Merced relocation center"
#3: Join different concepts with AND.
Merced
AND
detained OR relocated OR interned OR arrested OR incarcerated
AND
Japanese