The phrase "a fluid set of" is correct and usable in written English.
It can be used to describe a collection of items, ideas, or concepts that are adaptable or changeable in nature.
Example: "The project requires a fluid set of strategies to respond to the evolving market conditions."
Alternatives: "an adaptable range of" or "a flexible collection of".
Thatcherism was never a fixed but always a fluid set of attitudes and inclinations.
It's hard to look at how you affect development with such a fluid set of assets roaming around the countryside.
Not all of these decisions will be based on evidence of harm or illegality, but on a subjective interpretation of a fluid set of rules.
In its inherent disorderliness, strategic opportunism requires a great deal not only from the senior manager but also from the manager's subordinates, who must be able to tolerate working with a fluid set of agendas.
This new secrets exchange has its own set of bankable stars and one-hit wonders, high-rolling power brokers and low-level scammers, many of whom follow a fluid set of rules that do not always comport with those of state and federal law, let alone those of family or friendship.
And that's okay -- as long as you maintain proper form and a full range of motion (as you bang out reps, each burpee is going to look more like a fluid set of flops and jumps and less like the six crisp, separate movements enumerated above).
Literature helps develop these skills through the novelist's ability to capture a complex, fluid set of social relationships.
Today, what exists instead is a constantly changing, fluid set of relationships between London and Edinburgh, confused by feeble constitutional wheezes that arrive too late.
A fundamentally more fluid set of interactions between the edge and the core means everything has to work together better.
Demographic trends reveal an increasingly diverse and complex family life and a more ambiguous and fluid set of categories traditionally used to define the family (Cherlin, [2010]).
Rajagopalan, R., Vaucheret, H., Trejo, J. & Bartel, D. P. A diverse and evolutionarily fluid set of microRNAs in Arabidopsis thaliana.
