Thanks to http://ubuntuhandbook.org/index.php/2013/07/install-teamviewer-8-on-ubuntu-13-04-linux-mint/

Press Ctrl+Alt+T to open terminal, then get started with below steps:

1.) Check 32-bit or 64-bit by running this command in terminal

uname -m

i686 will mean your system is 32-bit.
x86_64 will mean you’re on 64-bit.

2.) Download TeamViewer 8 via command:

For 32-bit:

wget http://download.teamviewer.com/download/teamviewer_linux.deb

For 64-bit:

wget http://download.teamviewer.com/download/teamviewer_linux_x64.deb

3.) Install TeamViewer:

sudo dpkg -i teamviewer_linu*.deb

After that you can find TeamView from Unity Dash.

Enjoy!