The phrase 'every single effort' is grammatically correct and perfectly usable in written English.
You can use it to refer to someone's or a group's attempts to achieve a goal, for example, "My team have made every single effort to exceed our goals this quarter."
Saeb Erekat, the chief negotiator, said in a statement, "At a moment where the Palestinian leadership is doing every single effort to save the two-state solution, the Israeli government does everything possible to destroy it".
"We are anxious that this matter be resolved as quickly as possible, and that it be resolved by diplomatic means, and we are bending every single effort to that," the defence secretary, Des Browne, told BBC TV.
The RMT says it has made "every single effort" to resolve the disputes, accusing the train operators of "suspending" normal industrial relations.
I've supported every single effort to lower Medicare drug prices.
We will resist every single effort to make America into a small and spiteful place.
Let's mount an urgent and systematic state-by-state fight against the latest kinds of disenfranchisement and counter every single effort at voter suppression with redoubled commitments to voter education, voter registration, and voter turnout.
The point is that nobody can give 100% effort to every single cause, and perhaps each of us has his/her own favorite causes to support.
These days he still seems at the point of release to be on the verge of performing a display of air kung fu, but now it is all of a piece, every muscle – his ankles, earlobes, fingernails – joined in a single effort to make the ball fizz from off to leg.
That single effort was fast enough to qualify her for the Olympic Games".
"We realize a blog isn't going to resolve this complex issue, no single effort can.
In the operating adhocracy, the operating and administrative work blend into a single effort.
