The phrase "a determined group of" is correct and usable in written English.
It can be used to describe a collective of individuals who are resolute and focused on achieving a specific goal or objective.
Example: "A determined group of volunteers worked tirelessly to clean up the park after the storm."
Alternatives: "an unwavering team of" or "a resolute band of".
But a determined group of mates has used imaging data and a grader to bring him back.
American troops have been fighting house to house and mosque to mosque against a determined group of guerrillas.
A determined group of hecklers stalked her down Route 2. One held a Benghazi sign with letters that dripped blood.
But a determined group of Paterson officials, led by Mayor Lawrence F. Kramer, was on a scavenger hunt.
A determined group of nine men persuaded him to take the ship instead.
Unless, that is, a determined group of conservationists can save it.
The judging of Green, the last of the five perpetrators to stand trial for the murder of the civilian Iraqi al-Janabi family, is a triumph of a remarkably complex federal legal system, a small, determined group of reporters, including those from the Women"s Media Center who since 2006 have worked to keep Abeer in the world's mind, and of bloggers throughout the world with the same intention.
They are a very determined group of guys.
After graduation, Herman went to work for The New York Times and joined a small, determined group of women sportswriters who broke barriers in the profession, including the denial of access for locker-room interviews.
Mr. Gerson and Mr. Adler recount how a very determined group of people -- the relatives of the victims of the Pan Am bombing and their lawyers -- spent years and considerable amounts of money trying to bring the party responsible for the attack, the Libyan government of Muammar el-Qaddafi, to justice.
It was a small, determined group of Americans with Romanian children who in the early nineteen-nineties forced American medicine to deal with the problems of post-institutionalized kids....The orphans who began to arrive from the Eastern bloc presented American doctors with problems not seen in this country for many years.
