Certain keywords can be shortened into a set of capital letters, also referred to as an acronym. For example, the National Health Service is usually shortened to the NHS and Meticillin-Resistant Staphylococcus Aureus is nearly always shortened to MRSA.
When you put your search strategy together, you must be aware of any acronyms that may represent your keywords. It may be helpful to include them in the following way:
SATS OR Standard Assessment Tests