Creating Search Folder to contain files from last 14 days (Windows 7)

[Evolution]

Does anyone know how to create a saved search for office documents from the last 14 days? So far I have *.doc *.ppt *.xls *.txt datemodified:last week.. this week

However, that doesn't actually give the last two weeks, it just gives last week plus how days have expired this week.

datemodified:last 14 days or datemodified:last 2 weeks doesn't work and I clearly want it the last 14 days so I can't just select dates. Microsoft apparently has no documentation on how to create saved searches apart from clicking save.

Thanks