Perhaps you should try some spelling variations:
gnostic literature » erotic literature, artistic literature, music literature
nordic literature » norse literature, vedic literature, erotic literature
heroic literature » erotic literature, epic literature, arabic literature
indic literature » indian literature, vedic literature, medica literature

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: ((indic literature) OR (((((nordic literature) OR (gnostic literature))) OR (heroic literature)))) (english) / fast*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((indic literature) or (((((nordic literature) OR (gnostic literature))) or (heroic literature)))) (english) / fast*".