Searching in a structured way means that your search is:
A structured search is a search that is done for a research assignment, article, etc. In a structured search, you borrow search methodology from the systematic review but adapt it to your project.
The structured search is more limited than a systematic review, the latter aims to capture all relevant literature within a defined area. Other significant differences are that a systematic review is contucted according to a protocol and requires that at least two persons, independently of each other, review the search results.