If in "Settings - Accounts - Google" you give the three dots above and selecting "sync now" will make a synchronization of the entire Google account.
If you want the synchronization is done automatically, you have to activate the global mode for all accounts. From the settings menu not know how, but you can put any shortcut widget, which has a default Android is called "power control" and worth. The icon activates the timing is the fourth, the arrow (if you have another widget, the icon is the same):