Just upgrade Diary to v3.7.2 BETA that includes Moodle Tags. makes it much easier to find a particular entry. Still needs modification to go directly to the entry you select in the resulting list, when you click on a particular Tag.
Right now, if you click on a tag, the resulting list shows only the first 200 characters of any entry listed with that tag. I am open to suggestions on just how many characters to show. I have the limit set because some diary entries can wind up being very long based on the w**ing assignment. e.g. My students typical standard five paragraph essays, are usually over two-thousand characters.