I find that in land SAR situations you can easily find that people are ineffectively passing over ground without truly LOOKING. Sometimes one has to really work at making oneself look in a systematic way, as well as turning and looking behind at appropriate intervals.
In FIFWA, (Fighting In Forest and Wooded Areas), infantry are taught systematic ways of scanning the area in front of them, and above!
At ICAR Air Commission 2019, Renaud Guillermet (Securite Civile) presented on Limitations of the See-and-Avoid Principle based mainly on an Australian report of the same name from 1991. The limitations not only apply to general VFR but to searching also. I reported to SMR that much of what could be learned from this could be applied to searching on land.