Проверьте это
from scrapy.selector import Selector
body = '''
<div class="view-content">
<div class="views-row views-row-1 views-row-odd views-row-first">
<div class="views-field views-field-acronym">
<span class="field-content">15CBOOKTRADE</span>
</div>
<div class="views-field views-field-title">
<span class="field-content">The 15th-century Book Trade: An Evidence-based Assessment and Visualization of the Distribution, Sale, and Reception of Books in the Renaissance</span>
</div>
</div>
<div class="views-row views-row-2 views-row-even">
<div class="views-field views-field-acronym">
<span class="field-content">2D-CHEM</span>
</div>
<div class="views-field views-field-title">
<span class="field-content">Two-Dimensional Chemistry towards New Graphene Derivatives</span>
</div>
</div>
</div>
'''
for n in Selector(text=body).xpath('//span[@class="field-content"]/text()'):
print(n.get())
Вывод
15CBOOKTRADE
The 15th-century Book Trade: An Evidence-based Assessment and Visualization of the Distribution, Sale, and Reception of Books in the Renaissance
2D-CHEM
Two-Dimensional Chemistry towards New Graphene Derivatives