Perhaps you should try some spelling variations:
2c thesis » 2 thesis, _ thesis, my thesis
a thesis » _ thesis
2c metal » ic metal, sc metal, wc metal
c metal » sic metal, c methyl
2 male » 2 make
2 maii » 26 maii, 20 maii, 25 maii

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%_ metallurgy%((2 male) OR (2 maii))%((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%_ metallurgy%((2 male) or (2 maii))%((2c thesis) OR (a thesis))%_ archaeometallurgy%((2c metal) or (c metal))%22".
• Adding a wildcard symbol may retrieve word variants: %22archaeology%_ metallurgy%((2 male) or (2 maii))%((2c thesis) OR (a thesis))%_ archaeometallurgy%((2c metal) or (c metal))%22*.