| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | irrigation | Vietnam | Incorporates traditional rice paddy irrigation methods | 1 |
| 2 | irrigation in agriculture | Vietnam | Common and essential due to monsoon season and extensive rice cultivation | 1 |
| 3 | irrigation system | Vietnam | Ancient irrigation techniques were developed to support rice cultivation in flooded fields. | 1 |
| 4 | irrigation systems | Vietnam | Often incorporate traditional water conservation methods and have been part of agricultural practices for centuries | 1 |