In Google web search, when I search for:
+ortho4xp +image +compression
I receive one relevant site result containing the 3 words, followed by 6 results ridiculously telling me "Missing: +ortho4xp".
I only want to see pages that contain ortho4xp ! That's why I typed +ortho4xp
There is no "Must include ortho4xp" link next to these results to let me force the word (although that would be stupid anyway, I've typed the + prefix). I have also tried quoting e.g. +"ortho4xp" but this has absolutely no effect.
Before you ask, I have posted questions on the wasteland that is https://support.google.com/websearch in the past and received absolutely no useful response.
Best Answer
On further research it appears + is no longer a valid search modifier see https://support.google.com/websearch/thread/13355219?hl=en
Supposedly this helpful and obvious modifier clashed with the plus in the now dead Google+,
but of course it has not been brought back now we have "GSuite".
Instead it seems quoting takes its place now. However as stated in the linked thread, quoting doesn't always seem to have the desired result.
So instead of
we must use
I'm not sure if this actually works as using this I am now seeing many more results than using+