How can I replicate a search strategy described in a publication?
You should probably take a look at the Cochrane Handbook. What you have are two searches. The first is a search for papers about 3rd molars. The 2nd is the CHSSS and is used to find the RCT studies from the search of the 3rd molars. You need to enter the search items exactly as the history shows since some steps refer to previous steps (e.g., step 9 of the first search refers to steps 7 and 8).