Perhaps you should try some spelling variations:
2c thesis » 2 thesis, _ thesis, my thesis
2c metal » ic metal, sc metal, wc metal
27 maldi » 17 maldi, 7 maldi, _ maldi
c metal » sic metal, c methyl
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%((2c metal) OR (c metal))lurgy%((2 maldi) OR (27 maldi))%((2c thesis) OR (a thesis))%_ archaeometallurgy%((2c metal) OR (c metal))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22archaeology%((2c metal) or (c metal))lurgy%((2 maldi) or (27 maldi))%((2c thesis) OR (a thesis))%_ archaeometallurgy%((2c metal) or (c metal))%22".
• Adding a wildcard symbol may retrieve word variants: %22archaeology%((2c metal) or (c metal))lurgy%((2 maldi) or (27 maldi))%((2c thesis) OR (a thesis))%_ archaeometallurgy%((2c metal) or (c metal))%22*.