Аsk you to inform me information on international flights from Guangzhou to Thailand, Laos, India?

To Thailand (Bangkok), China Southern Airlines, Thai AirAsia, Kenya Air are all available.

To Laos (Vientiane Airport), you need a transfer. Vietnam Airlines, China Eastern, Thai Airways International are available for you.

To India (Deihi): China Southern Airlines is available. If you want to take others, you need transfer.

For more flight info, you can search in the flight page of this website.
Routes from GZ to Singapore, Vietnam, Indonesia are available too.