Perhaps you should try some spelling variations:
2.2 archaeometallurgy » _ archaeometallurgy, 1 archaeometallurgy, 10 archaeometallurgy
2c thesis » 2 thesis, _ thesis, a thesis
27 maldi » 17 maldi, 7 maldi, _ maldi
sc metal » sic metal, c metal, ic metal
2 maldi » 12 maldi, _ maldi, a maldi

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: %22archaeology%((27 metallurgy) OR (_ metallurgy))%((2 maldi) OR (27 maldi))%2c thesis%2.2 archaeometallurgy%sc metal%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22archaeology%((27 metallurgy) or (_ metallurgy))%((2 maldi) OR (27 maldi))%2c thesis%2.2 archaeometallurgy%sc metal%22".
• Adding a wildcard symbol may retrieve word variants: %22archaeology%((27 metallurgy) or (_ metallurgy))%((2 maldi) OR (27 maldi))%2c thesis%2.2 archaeometallurgy%sc metal%22*.