How do I combine several conditions with parentheses?

Use parentheses to group alternatives and combine them with other conditions. Terms separated by spaces are all required, while | accepts at least one alternative.

Examples:

• "stem cells" (therapy | treatment | transplant): match the phrase together with any of those clinical terms.
• (CRISPR | "gene editing") ("sickle cell" | "cystic fibrosis"): match a gene-editing term and one of the disease expressions.
• ("deep learning" | "neural network") (protein | genomics) -tutorial: combine AI and biology terms while excluding videos containing "tutorial".

Groups also work with proximity searches, such as ("dopamine" | "serotonin") NEAR/10 ("receptor" | "pathway"). Title fields accept the same syntax.