Step 4 of 18 of the SQL tutorial. LIKE compares with two wildcards: % for any run of characters, _ for exactly one. In SQLite it ignores case for ASCII, so %ethyl% also finds Ethyl acetate. Mango has no LIKE; it has $regex, which is case-sensitive, so the same 112 compounds need [Ee]thyl spelled out. Neither can search inside the names table from here — that needs the next group.
It opens on the query SELECT preferred_name, formula, nb_suppliers FROM compounds WHERE preferred_name LIKE '%ethyl%' ORDER BY preferred_name LIMIT 20, which you can run and change in place.
Ask the same question of a chemical dataset in SQL and in Mango and compare the two answers. The database is a SQLite file your browser downloads once and queries locally, so nothing you write ever leaves your machine — which is also why the tool needs JavaScript.