The combination is the query. A manual, a patent or a datasheet paired with two languages is what somebody types, and a page addressing one pairing competes against far less than a page about translation in general.
Certified documents bring private individuals. Somebody needing a birth certificate or a qualification recognised is worried about being rejected by an authority, and reassurance about the exact procedure converts them immediately.
Procurement searches by standard. Buyers in regulated industries look for named quality standards and certifications because their own audit requires it, and those pages reach organisations rather than individuals.
Deadline words appear in the search itself. Urgent, same day and overnight come from people who will pay more, and an agency that states honestly what can be done overnight wins that work.