I don't know why it is not functioning these past few days but here's an alternative.

As of now I am using Brave Browser and my default search engine is duckduckgo.com as I prefer privacy using the internet. GOOGLE SUCKS. Whenever I wanted to search something outside the forum. I usually type "bct", "bitcointalk" or "site:https://bitcointalk.org" after the term I am looking for. Honestly, using search engines outside the forum is better than using forums search engine as it might give you a wide variety of results.

Here's an example.
erc20 site:https://bitcointalk.org