Although it's still Google, it only searches through journal articles and other such documents. While it may only list them for us if we're not willing to pay for access, it's a helpful tool for finding articles that we can then look up in the Library databases to see if we have access.
Though if you've used the "connecting Google Scholar and the library" material pointed to in the learning path, you'll be able to access the papers directly from here (at least the ones that the USQ library has access to)
Research article comparing two experienced Geography teachers use of PCK. The article argues Geography teachers need extensive content knowledge, understand how knowledge is constructed and in particular that teachers need to address students preconceptions and incorporate them into teaching and learning.
Theories and Models of Learning for Educational Research and Practice. This knowledge base features learning theories and models that address how people learn. A resource useful for scholars of various fields, including educational psychology, instructional design, and human-computer interaction.