Perhaps you should try some spelling variations:
"vietnam war, 1961-1975 protest OR protect movements" » "vietnam war, 1961-1975 proquest OR protect movements" (Expand Search), "vietnam war, 1961-1975 protest OR project movements" (Expand Search), "vietnam war, 1961-1975 protest OR projects movements" (Expand Search)
"vietnam war, 1961-1975 protest OR protect movement" » "vietnam war, 1961-1975 proquest OR protect movement" (Expand Search), "vietnam war, 1961-1975 protest OR project movement" (Expand Search), "vietnam war, 1961-1975 protest OR projects movement" (Expand Search)

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