can a literature review be broad

Limitations of Study
In specifying precisely one’s research topic, one is also specifying appropriate limitations on the research. Limiting, for example, by time, personnel, gender, age, location, nationality etc. results in a more focused and meaningful topic.
However, this is more focused and specific and, accordingly, a more appropriate topic:

You can always find the topics here!
The “moving wall” represents the time period between the last issue available in JSTOR and the most recently published issue of a journal. Moving walls are generally represented in years. In rare instances, a publisher has elected to have a “zero” moving wall, so their current issues are available in JSTOR shortly after publication.
Note: In calculating the moving wall, the current year is not counted.
For example, if the current year is 2008 and a journal has a 5 year moving wall, articles from the year 2002 are available.

References:

http://www.jstor.org/stable/20451692
http://libguides.wpi.edu/literaturereview