"make a concerted" is correct and usable in written English.
It's usually used to describe a focused effort, as in: "They made a concerted effort to reduce their carbon footprint."
"To make a concerted effort to look for a character that I'm not artistically repeating myself".
They really did make a concerted effort to curb those abuses.
"They actually make a concerted effort to find something great," he added.
Some teams still do not make a concerted effort to block shots.
"Make a concerted effort to raise the status of the teaching profession" was the top recommendation.
I make a concerted effort not to act like their mom.
But if we make a concerted effort, they are not insurmountable".
You make a concerted effort to change it, and it still doesn't change".
I grabbed one, and had to make a concerted effort to push one sheet across another.
The Clinton administration should make a concerted effort to find out.
Five minutes later, make a concerted effort to remember what the heck it was about.
