Perhaps you should try some spelling variations:
2c thesis » _ thesis, a thesis, my thesis
2c metal » ic metal, wc metal, sic metal
sc metal » sic metal, ic metal, wc metal
2 thesis » 2 thess, 2 theil, 2 themes
c metal » sic metal, c methyl
2 maldi » 12 maldi, 27 maldi, _ 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 (((sc metal) OR (c metal))))lurgy%2 maldi%((2c thesis) OR (2 thesis))%_ archaeometallurgy%((2c metal) OR (((sc metal) OR (c metal))))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22archaeology%((2c metal) or (((sc metal) OR (c metal))))lurgy%2 maldi%((2c thesis) or (2 thesis))%_ archaeometallurgy%((2c metal) or (((sc metal) OR (c metal))))%22".
• Adding a wildcard symbol may retrieve word variants: %22archaeology%((2c metal) or (((sc metal) OR (c metal))))lurgy%2 maldi%((2c thesis) or (2 thesis))%_ archaeometallurgy%((2c metal) or (((sc metal) OR (c metal))))%22*.