Why Voynichese doesn't have cribs?

[Rafal]

Isn’t a crib just a word or phrase we expect to exist in a text? When trying to decipher a text we guess what words might be found and possibly where we would expect the word to be found. We also have to assume a language for the plaintext or try our best set of cribs in multiple languages to see if we can make it fit.

Yes, when you are not sure about the language you can try "universal" words.

Michael Ventris, when working with Linear B, wasn't sure it is very old Greek. For a long time he suspected Etruscan or other language. But he assumed Knossos must be more or less the same in any language. It turned right, it was Konoso.

Later when he had a few symbols deciphered, to his surprise he started getting Greek words.