"boost their growth" is correct and usable in written English
You can use it when you are referring to boosting business or personal growth. For example, "The marketing department implemented a new strategy to boost their company's growth."
It wasn't there to boost their growth," he said.
It was an aberration (September 2014) How poor countries can boost their growth (September 2014) Why Asian and Western businesses will become more alike (May 2014).
Little of it has directly benefited economies that are struggling to boost their growth rates, expand employment, avoid creating a lost generation of workers, and address excessive income inequality.
As such, every effort should be made to boost their growth.
Game developers might find this feature useful to boost their growth.
I think we can significantly help them boost their growth and global distribution".
Suppression of plant defenses has been shown to benefit herbivores by boosting their growth and reproductive performance.
To boost their profit growth, companies can either add mass or speed their sales of home-grown products ever upwards.
Or perhaps they have become more pragmatic, realising that they need China to boost their anaemic growth.
China's economic slowdown, together with the end of the commodity super-cycle, will create additional headwinds for emerging economies, most of which have not implemented the structural reforms needed to boost their potential growth.
The 20th and 21st centuries have seen the next-biggest exchange of food, as companies seek new sources of products and new markets to boost their flagging growth.But the developing world can be tough.
