You can search for several words and use complex queries using logical operators:
| Operator | Meaning |
| And, &, + | Logical AND. Both words merged by the operator must be present in the document. |
| Or, | | Logical OR. Any of the words merged by the operator must be present in the document. |
| Not, ~ | Logical NOT. The word, which follows this operator, must be NOT present in the document. |
| () | Grouping operator. |
| "" | Phrase search. When several words are quoted, they constitute a phrase which is treated as a single word during search. |