In English, when using two or more words as attributive I join them with en-dashes.

> If you're desperate for dual-GPU performance, the 18.4-inch Alienware 18 has a dual-GeForce GTX 880M option

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> That was a I-know-what-I-do remark.

How do I use a group of words as attributive, in Esperanto?  
I know the translation of _solar system_ is _sunsistemo_, but how do I make a phrase like _solar system_ an attributive? How does it work with, for example, three words?