you might create a formula text field to filter on.
For Month and Year combo:
case(month([date field]),
1,"January "&year([date field]),
2,"February "&year([date field]),
3,"March "&year([date field]),
4,"April "&year([date field]),
5,"May "&year([date field]),
6,"June "&year([date field]),
7,"July "&year([date field]),
8,"August "&year([date field]),
9,"September "&year([date field]),
10,"October "&year([date field]),
11,"November "&year([date field]),
12,"December "&year([date field])
)
To separate out month and year,
Create a formula text field called 'Year'. Formula is: year([date field])
Create a formula text field called 'Month'. Formula is:
case(month([date field]),
1,"January",
2,"February",
3,"March",
4,"April",
5,"May",
6,"June",
7,"July",
8,"August",
9,"September",
10,"October",
11,"November",
12,"December"
)
Let me know if that works for you. =]