How this tool builds your string
A good systematic-review search has two rules: synonyms of the same idea are combined with OR, and different ideas are combined with AND. So "greenwashing OR green-washing" (one concept) AND "consumer OR customer" (another concept) finds papers that discuss both ideas together. This tool wraps each block in parentheses and applies the right field tags for your database automatically.
Tight vs loose - when to use which
Slide to tight when you're getting thousands of irrelevant hits: it adds phrase quotes and, where supported, proximity operators so terms must appear near each other. Slide to loose when you're missing papers you know exist: it adds truncation wildcards (e.g. sustainab*) to catch word variants and widens the field scope. Start balanced, run the search, then adjust based on what comes back - and always record your final string for the methodology section.