If you see any mistakes in the following sentence, can I have your comments?
The above is not a good question. If no one answers, you won't know if there are no mistakes or if there are mistakes but no one bothered to tell you that there are mistakes.
You should say something like 'Are there any mistakes in the following sentence? If so, can I have your comments.'
Google has a strong search system, while Yahoo is a good tool for online communication and entertainment.
The sentence is fine, but I would put a comma after "system".