Not every database will provide the full text of every article you find. If you aren't instantly connected to the article's full text, keep an eye out for the Find This for Me link:
If you still can't get access, request it through Delivery/Interlibrary Loan:
​Make sure to set your Google Scholar library preferences so you can get the full text of articles through University of Nebraska-Lincoln Libraries subscriptions.
From the Scholar homepage:
University of Nebraska-Lincoln Libraries provides access to an incredible amount of information, which can often be overwhelming. If you're just starting your research and don't know where to look first, I recommend these databases for most undergraduate research topics:
Scholarly literature, including peer-reviewed papers, theses, books, preprints, abstracts and technical reports in all subject areas. Some articles are available in full-text through links to UNL's journal subscriptions. (Index)
Index to scholarly journals, books, conference proceedings, and patent records covering the fields of science, mathematics, engineering, technology, health and medicine, social sciences, and arts and humanities. (Index)