Nadya,
>(BTW, why View designer puts "(" this strange way and how can I fix it?)
>
The parenthesis can be adjusted using the Pri. (Priority) column on the Filter tab in the View Designer. If you don't want any parenthesis, set all conditions to the same priority. If you want to have parenthesis around 2 conditions, give them a lower number (higher priority), and your other conditions a higher number.
Sometimes I 'View SQL' and set the parenthesis how I want them, but the View Designer changes them, and I have to set the numbers manually.