Simple search

• quest — finds “quest” (fuzzy)
• ^SN or ^AN — only in that collection (e.g. SN, AN, MN, DHP)
• !word — exclude discourses containing word
• 'jhana or "jhana" — exact word “jhana” (short suffixes OK, e.g. 'sati matches “satima” but not “cessation” or “satisfaction”)
• "letting go" — exact phrase (each word exact)
• illusion | ignorance — either word
• akuppa cetovimutti or animmita — Pali terms (fuzzy)

Combining

• ^SN consciousness — SN discourses that mention consciousness
• !^DHP — all collections except DHP
• ^AN urgency !mindfulness — AN discourses with “urgency” and without “mindfulness”

By field (advanced)

Restrict to title or body: title:..., content:...

• title:element content:consciousness — title contains “element”, body contains “consciousness”
• title:element (content:space | content:consciousness) — title “element”, body has “space” or “consciousness”

PTS citations

Look up a discourse by Pali Text Society volume/page. Use a pts: (or volpage: / leading PTS) prefix so ordinary searches are not affected.

• pts:AN V. 91 — Anguttara volume V, page 91 (covers mid-sutta pages too)
• pts:MN 2 or pts:MN ii — all discourses in that PTS volume
• pts:SN V 31 or volpage:SN ii 4 — Samyutta citations
• PTS 4.152 — numeric volume.page (may match more than one nikāya)
• pts:Iti 27 — single-volume collections (Iti, Ud, Snp, Dhp, …)