Finding keywords for a search is a process of trial and error; you will not always find the right words immediately. However, if you find one book on your topic, the LCC subject heading in the record for that book can lead you to other resources.
To get started, try some of these words along with the name of your country:
Call numbers classify books by subject and can help you to locate additional resources. Browsing the shelf where you found one book can lead to finding others on the same subject.
Subclass GF--Human ecology (aka "Cultural Geography" or "Human Geography")
GF1‑900 Human ecology. Anthropogeography
GF51 Environmental influences on humans
GF75 Human influences on the environment
GF125 Cities. Urban geography
GF127 Rural settlements. Rural geography
GF500-900 By region or country
Subclass BL --Religions
BL1-2790: Religions. Mythology. Rationalism
BL1-50: Religion (General)
BL74-99: Religions of the world
BL410: Religions in relation to one another
BL425-490: Religious doctrines (General)
BL660-2680 History and principles of religions
Subclass JZ --International Relations
JZ5-6530 International relations
JZ221-1153 By region or country
JZ1249-1254 Relation to other disciplines and topics
JZ1305-2060 Scope of international relations. Political theory.