The phrase 'contributed to strengthening' is correct and can be used in written English.
You can use it when referring to a person or thing that has helped to make something stronger. For example: The training program contributed to strengthening the team's core skills.
Russia's policies in Syria have, by aiding the Assad regime, contributed to strengthening Islamic State rather than defeating it..
On economic and financial matters, the G-20 summits in Washington and London contributed to strengthening the dialogue between developed and developing nations.
Formation of more polymerized H M A S phases contributed to strengthening the matrices and hinder axial cracks; consequence of toughening mechanisms developed by the coarsening on molecular scale of H M A S.
From microscopic observation, they suggested that spherical particles had a tendency to adhere to the electrodes, while elongated particles contributed to strengthening the particle chain.
Now, the NSS process has contributed to strengthening the international nuclear security architecture and upholding international peace and security.
Two calamities in the autumn of 1906 shocked African Americans, and contributed to strengthening support for Du Bois' struggle for civil rights to prevail over Booker T. Washington's accommodationism.
The Bush years did bring something good to Latin America as the disastrous White House diplomacy contributed to strengthen Latin American cooperation.
In addition to writing poetry, Blanco has also collaborated as faculty for several educations organizations, as well as contributed to strengthen communities where he works with students on the creation of poetry.
The three rehabilitated wastewater laboratories have contributed to strengthened wastewater testing capabilities in Najaf, Ninewah and Diwaniyah.
CL contributed to strengthen the methodology of the study and determine the best data acquisition device and revision of the manuscript.
