Yes. It's wrong - probably a typo. According to ngrams, 'a such thing' doesn't even exist:

It's not correct. It should either be "such a thing" or "any such thing".

"such" is a pronoun, like "my" so no article is needed

Hi Alex, you cannot say 'a such thing' but you can say 'such a thing'. The word order is very important in English. 😉 You can therefore ask: Is there such a thing as a perfect* relationship for you? Or ideal* I hope that this helps you 😀

你会中文吗