"through concerted efforts" is correct and can be used in written English.
This phrase is used to indicate that something was achieved by working together. For example: "The environmental problems were addressed through concerted efforts by the government and citizens."
Mr. Wright and Mr. Czelusta point out that some Latin American nations, like Chile, Peru and Brazil, developed mineral resources through concerted efforts at investment and development.
The safest route to reduce nuclear dangers on the subcontinent is through concerted efforts to improve relations between Pakistan and India.
But many others came about through concerted efforts in the 19th century to expand the range and reduce the cost of colours for use in industry.
And we noted that the B.P.C. has made substantial progress on key elements of its comprehensive agenda through concerted efforts by many of its working groups to engage with nongovernmental actors on both sides of the relationship.
It was only through mobilising a larger health workforce, including professionals from outside the affected region as well as lesser-trained practitioners and community health workers, and through concerted efforts to regain the trust of communities that the epidemic was eventually effectively addressed.
A first set of camel pastoralists were identified through concerted efforts of the District Veterinary and Animal Production Officers in Borno and Yobe States of Northeastern Nigeria.
It will only be achieved through many years of concerted efforts.
Only now are concerted efforts to reduce smoking through increased taxation and antismoking advertisements starting to work.
Around the world, cities are making concerted efforts to limit car use, whether through temporary events or new policies.
These concerted efforts blunted piracy actions.
Democracy must be crafted through concerted effort; the Internet may help this process, but it does not guarantee an easy ride.
