Use quotation marks to search for an "exact phrase". Append an asterisk (*) to a search term to find variations of it (transp*, 32019R*). Use a question mark (?) instead of a single character in your search term to find variations of it (ca?e finds case, cane, care).
COM (2018) 517:
Proposal for a COUNCIL DECISION on the signature, on behalf of the European Union, of the Agreement in the form of an Exchange
of Letters between the Union and the People's Republic of China in connection with the WTO dispute settlement proceedings
DS492 Measures affecting Tariff Concessions on Certain Poultry Meat Products