Perhaps you should try some spelling variations:
2c archaeometallurgy » 2.2 archaeometallurgy, _ archaeometallurgy, 1 archaeometallurgy
2c thesis » _ thesis, my thesis, i thesis
2 thesis » 2 thess, 2 theil, 2 themes
a thesis » _ thesis
sc metal » sic metal, c metal, ic metal
2c metal » c metal, ic metal, wc metal
26 maii » 26 mai, 26 martii
2 maii » 20 maii, 25 maii, 28 maii

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))lurgy%((2 maii) OR (26 maii))%((((2c thesis) OR (a thesis))) OR (2 thesis))%2c archaeometallurgy%((2c metal) OR (sc metal))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22archaeology%((2c metal) or (sc metal))lurgy%((2 maii) or (26 maii))%((((2c thesis) OR (a thesis))) or (2 thesis))%2c archaeometallurgy%((2c metal) or (sc metal))%22".
• Adding a wildcard symbol may retrieve word variants: %22archaeology%((2c metal) or (sc metal))lurgy%((2 maii) or (26 maii))%((((2c thesis) OR (a thesis))) or (2 thesis))%2c archaeometallurgy%((2c metal) or (sc metal))%22*.