'unable to obtain data' is a correct and usable part of a sentence in written English.
You could use it to describe a situation in which someone has tried to access or acquire data but was unsuccessful. Example: "We were unable to obtain data about the local economy from the government records."
Other regions were unable to obtain data for some tidal levels or not at the full level of replication.
We acquired the oil and gas wells database from IHS Incorporated (2007, www.ihsenergy.com) for all states in the study area excluding California and southeast New Mexico, for which we were unable to obtain data.
Third, we were unable to obtain data retrospectively from persons with false-positive results about medical conditions (e.g., Epstein-Barr virus infection, hepatitis A and B infection, rheumatoid factor, or multiparity) which might be associated with false-positive OraQuick Advance results [1].
We were unable to obtain data on patients' race from the provider.
Unfortunately, we were unable to obtain data on the exact number of cases in which adjustments were made peroperatively.
We were unable to obtain data for four of the 11 identified studies that fulfilled the inclusion criteria.
Ruptures on multiple faults are probably involved in the Mj 7.0 event, but, from the InSAR data we are unable to obtain information regarding the time history of the ruptures.
We were unable to obtain information for six patients.
To avoid the risk of retrieval bias we did not contact the original investigators for more detailed information when we were unable to obtain complete data and protocols from all studies or to check accurateness and reliability of the obtained data.
The other key omission was data from the Asian Development Bank (we were unable to obtain disbursement data by country from the Asian Development Bank globally) and the Islamic Development Bank.
We were unable to obtain dosimetric data for the remaining patients because of breakdown of the data during the review of dosimetry.
