I used to litigate patents, and for international searches I have not found an adequate substitute. Depending on why you are searching, searching may be inadvisable anyway, at least in the U.S. if your search uncovers a specific patent (or even arguably should have uncovered a specific patent) and you are later sued by the rights holder for infringement, your actual knowledge of the patent can be used against you to show willful infringement, a damage multiplier. Apparently, companies that know about a patent need to hire competent legal counsel to analyze the patent with respect to their products and give them an opinion on possible infringement. That process can be quite expensive, so it is often better to not search in the first place. I wrote a few opinions over the years, but it was not a common activity. Accusations of willful infringement were pretty common in litigation though, probably about 40% of my cases.

Just writing this quick summary makes me glad I retired from practicing law.

Also, you are not my client, this is not legal advice, I might be a fraud, yadda yadda yadda.