The phrase "are difficult to support" is correct and usable in written English.
It can be used when discussing ideas, arguments, or positions that lack sufficient evidence or backing.
Example: "Many of the claims made in the article are difficult to support with credible sources."
Alternatives: "are hard to justify" or "are challenging to substantiate."
In particular, significant aspects of social trust are difficult to support in neo-liberal organisations.
Minor points: 1) The statement that ES cells have a less compact Hox locus conformation are difficult to support by just 4C data.
Of the 326 models that failed 262 fell into 3 categories, those that contained: (1) 0-dimension or 1-dimension compartments that are not supported in STEPS, (2) no chemical species (STEPS requires at least one chemical species in order to run a simulation) and (3) Algebraic Rules, which are difficult to support in a STEPS context and rarely appear in SBML models.
At the time, Morgan said it would be "difficult to support the proposals".
It is difficult to support collaborative design with a conventional ship CAD system that manages design information using files.
Certainly it's difficult to support his actions this week – we know the study is everything, but I don't think it's as simple as that.
That leaves the police now looking into the leak few options other than pursuing breach-of-trust charges, which may be difficult to support in court.
However, enrollments are so small in some languages that it is difficult to support a teaching program (e.g., Dutch, Zulu, Romanian).
Of course upon such an income, the family pride was difficult to support, and the means of education for the younger branches extremely restricted".
Mr. A. O. Walker's theory that the queens of last year's spring were largely infertile would be difficult to support by observation.
But the idea that the fat profile of organic milk makes it a better choice for broad health reasons than conventional milk is difficult to support.
