The phrase "making it difficult to obtain" is correct and usable in written English.
You can use it when you are talking about something that is hard to get. For example: "The limited availability of the product is making it difficult to obtain."
However, the size of the matrix A is very large, making it difficult to obtain its inverse matrix.
However, the lack of studies on its safety, tolerability, system exposure and pharmacokinetics making it difficult to obtain a consistent picture of its mechanism of action.
B7 Human Rights UNITED NATIONS -- No major human rights group currently has its own monitors in Afghanistan, making it difficult to obtain credible information about reports of mass killings from the scene.
Mr. Johannesen, a Conservative, said Islip had a reputation for making it difficult to obtain public information.
Now Mr. Hsu is in federal custody in California, making it difficult to obtain his description of his past business dealings.
The upcoming vice-chancellor of the University of Oxford, Louise Richardson, argued that the UK should not be raising barriers by making it difficult to obtain student visas.
This makes the nonlinear behaviour of a member curved in space very complicated, making it difficult to obtain a consistent differential equation of equilibrium for the nonlinear analysis of members curved in space.
We also performed chronopotentiometric experiments in which we found that the OER activities dropped rapidly because of fast dissolution of Ru and Sr cations, making it difficult to obtain accurate measures, so we decided to present only potendiodynamic results.
Although Cuba lies just off our shores, problems of politics have made it difficult to obtain knowledge of its dance activities.
This would make it difficult to obtain Spanish-speaking community members to provide religious, social, medical, educational services".
The article said the lack of such evidence could make it difficult to obtain the death penalty against Mr. Muhammad.
