You used a text field so standard date ranges will not work
example for 2015-2016
Code:
#review:first read\,>=\d\d \d\d 2015 and #review:first read\,<= \d\d \d\d 2016
Note the text
So you need the field name: #review:
you need the words with comma: first read\,
you need wild cards for all non critical digits \d\d\s\d\d\s
then the actual 4 digit year
Another way for the year part if consecutive
Code:
#review:first read\,>=\d\d \d\d 201[5-6]