Perhaps you should try some spelling variations:
"belov, sergey a OR sergio a ." » "belov, sergey a OR sergio da ." (Expand Search), "belov, sergey a OR sergio j ." (Expand Search), "belov, sergey a OR serio a ." (Expand Search), "below, sergey a OR sergio a ." (Expand Search), "belo, sergey a OR sergio a ." (Expand Search)