"concerted will" is correct and usable in written English.
It is used to express a collective effort or shared resolve to do something. Example: The teachers and students had a concerted will to improve the quality of education in the school.
What we need is concerted will.
The crisis makes any concerted will to "resist" awkward for those whose careers depend on rich collectors and élite institutions, sitting ducks for plain-folk resentment.
France will play its normal role as a difficult ally, but in the end it will not stop the concerted will of America and Britain.
The family surrounds her with loving hands so tender, so persistent, so firm, that one almost feels she was pulled into recovery by their concerted will, supported by her own valiant and admirable determination.
We can only make our best effort to address conditions which, while apparently intransigent, can yield before the concerted will of community-wide effort.
Referring to a new class of recruits that included just one woman — proportionally less than 1.5% — the mayor said, "Don't tell me we can't get 3%." A steady, concerted campaign will be required to encourage women to apply, he said.
If driven by unequal crossing-overs, concerted evolution will result in repeat array size polymorphism.
These concerted efforts will bring Kenya's vision of an AIDS-Free generation closer to realization.
Indeed, Professor Sir Michael Marmot recently referred to health inequities as a "stain on our society" which requires concerted political will and moral imperative to change [ 8].
As more than 23% of UK adults still smoke, 24 rising to over 40% in some areas, 25 continued concerted efforts will be required to reduce the burden of smoking related illness and premature death.
Update: Since there's been such a curiously strong reaction to this post (some of which I suspect is concerted), I'll just clarify a few things.
