'improve the capacity' is correct and can be used in written English.
You can use it to refer to an increase in the amount or number of something, such as goods, resources, or skills. For example, "The government is working on initiatives to improve the capacity of the health care system."
All countries must improve the capacity of their national statistics to regularly collect basic data on women and men.
Third, Barclays will improve the capacity of local institutions, groups and financial intermediaries to provide relevant financial services to Katine.
Of course, further developments are needed to improve the capacity of the system, energy efficiency, lifetime and so on.
"The coalition will work with all parties to reform and improve the capacity of the police, judiciary and Election Commission," he said.
American officials believed the training program was essential to improve the capacity of the nearly 150,000 Pakistani soldiers deployed to fight the Taliban in the tribal region.
World health ministers will meet in Canada next month to discuss how to pool resources, boost surveillance and improve the capacity to contain and respond to an outbreak.
He laid out plans to align what GPs do with the rest of the NHS, to improve the capacity of general practice and increase numbers of GPs.
Somali officials have also said that American intelligence agents frequently visit Somalia in an effort to improve the capacity of Somalia's fledgling security services.
Ajit Kumar Doval, former chief of the Intelligence Bureau, India's internal intelligence gathering agency: NCTC will definitely improve the capacity and capabilities of our counter-terrorism efforts.
Asked what he thought of the American goal to improve the "capacity" of the administration of which he is a senior member, Mr. Iqbal, the Pakistani official, who attended college in the United States, replied, "Bunkum".
It is long past time to recognize that unless we improve the capacity of every country to stop threats like Ebola, more needless fear, and many preventable deaths, are inevitable.
