The truth logic of boolean searches using both AND and OR on simple word and phrase terms make no sense to me.
(When AND or OR are used alone on simple word or phrase searches, they do make sense.)
I have double-checked the data in the table below.
It has links to actual searches so you too can verify, in one minute, the table is accurate.
Then you too can confidently explore the reality of this table and conclude "no pattern".
There are four basic search terms (word or phrase), shown in bare and in Boolean searches.
There are six pages in the search domain: S, A, B, C, E, and F.
| Search | R | e | s | u | l | t |
| 1 | S | A | C | E | ||
| 2 | A | B | C | F | ||
| [3](//mediawiki.org/w/index.php?title=Special:Search&profile=default&search="the number"+prefix:user:cpiral&fulltext=Search) | E | F | ||||
| 4 | S | A | E | F | ||
| 3 OR 4 | S | A | E | F | ||
| 3 AND 4 | E | F | ||||
| 1 AND 2 OR 3 | S | A | C | E | ||
|---|---|---|---|---|---|---|
| 2 AND 1 OR 3 | A | B | C | F | ||
| 1 OR 2 AND 3 | F | |||||
| 2 OR 1 AND 3 | E | |||||
| 2 OR 1 AND 4 | S | A | E | |||
| 3 OR 1 AND 2 | A | C | ||||
| 3 OR 2 AND 1 | A | C | ||||
| 1 AND 2 OR 3 AND 4 | E | |||||
| 1 OR 2 AND 3 OR 4 | A | B | C | F | ||