Parents' 2nd Time Visit To USA - How much gap needed between visits?

Ladies,

My parents entered US the first time in Feb first week of 2014 and left USA in August 1st week. I'd like to know when they can enter again to US to get full 6 months visa?

I've heard that they can enter any time. but if they have not stayed out of USA for more than 6 months, they won't get 6 months visa this time. is it true?

When should I book their tickets for the next visit? I'd like them to be here as soon as possible (possibly first week of Feb or last week of Jan 2015).

Let me know. thanks..

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Parents' 2nd Time Visit To USA - How much gap needed between visits?