"thwarted efforts" is correct and usable in written English.
You can use it to refer to when a plan or goal has been prevented from succeeding by an outside force. For example, "Despite their best efforts, their plans were ultimately thwarted by heavy rains."
In the United States, Amazon successfully thwarted efforts to unionize.
The leaders of Brookhaven Laboratory seized on the opportunity to redeem their thwarted efforts on Isabelle.
The disruption thwarted efforts to focus the meeting on events surrounding the stabbing, Gutzmore said.
But a long-running debate has thwarted efforts to address the problem both at the federal and state level.
Ms. Isles said government officials regularly thwarted efforts to get an accurate count of the number of people at Maslakh.
And the plan follows decades of thwarted efforts to bring effective ethics enforcement to a capital plagued by corruption.
But enough voters cast ballots that Afghan officials said they had thwarted efforts by the insurgents to derail the vote.
Republican lawmakers in the United States have thwarted efforts to pass comprehensive immigration reform, despite the obvious economic benefits.
Protests here have crystallized around the thwarted efforts by one prominent Rapanui clan, the Hitorangi, to reclaim land on which a luxury hotel was recently completed.
But the bargain was one that the president deemed necessary to forestall industry opposition that had thwarted efforts to cover the uninsured for generations.
Academics and a network forensics expert presented a sweeping indictment of the reliability of electronic voting machines, and voters testified about thwarted efforts to vote for Mr. Rawl.
