myTable = {{"hello1","hello2"}, {"Wasup?1", "Wasup?2"}}

function find(t, value)
    local newObject = nil
    table.foreach(t, 
        function(num, item)
            table.foreach(item, 
                function(numeration, object)
                    if object == value then
                        newObject = object
                    end
                end)
        end)
    return newObject
end

print(find(myTable, "hello1"))