The phrase "has difficulties" is correct and can be used in written English.
Example: Sarah has difficulties understanding the new math concepts.
But Mr Zoellick has difficulties elsewhere too.
Despite his confidence, Mr. Aliyev has difficulties at home.
It has difficulties levying tolls since trade has dried up.
He, too, is autistic and has difficulties socialising.
He can confide in me if he has difficulties or problems.
But even a big organisation like the Pleasance has difficulties balancing the books.
That's not to say that SAS never has difficulties with employees.
A disenchanted C.I.A. agent has difficulties and gets caught up in the agency's affairs.
Brian sometimes has difficulties concentrating due to his drug regime and can be confused and forgetful.
Like cities in other eastern European countries, Prague has difficulties with the supply and maintenance of housing.
"The old paradigm has difficulties, many of them," said Jan M. Lodal, a former Pentagon official in the Clinton administration.
