It is true, but it is nonstandard expression in informal speech.
However, It's possible, and allowed, to use "ci" (that becomes "ce" as you probably already know) with another pronoun with the aim to emphatize the sentence, for example: "Non hai mangiato nulla, non ce l'hai un po' di fame?"
But you should avoid, mostly in writing, the forms "c'ho", "c'hai", c'ha"... and, if you can't, you should write them as "ci ho", "ci hai", "ci ha"... because, dropping the "i", the sound of "c" change from /Ч/ to /К/. Definitely, that kind of elision is out of the rules.