PHỞ.FUN EDUCATION DATA — SOURCES AND LICENSES

English–Vietnamese dictionary-derived exercise data
Dictionary data: Từ điển Anh–Việt thichhoc.com (thichhoc-dict), licensed CC BY-SA 4.0.
https://github.com/thichhoc-org/thichhoc-dict
Modified: selected dictionary headwords and Vietnamese glosses are presented in learning exercises with new questions, distractors, explanations, and audio prompts. These adapted dictionary-derived records are provided under CC BY-SA 4.0.
The dictionary data source lists WordNet 3.1 (Princeton), CMUdict (CMU), and Wiktionary as upstream sources. See thichhoc-ATTRIBUTION.txt for the full upstream notices.

Vietnamese sayings and idioms
Selected expressions and meanings are from VIVID: Vietnamese Idiom and Proverb Dataset, ReML-AI. The source dataset is licensed under MIT.
https://github.com/ReML-AI/VIVID
https://github.com/ReML-AI/VIVID/blob/main/dataset/VIVID_Dataset.csv

The frequency-ranked English word list was used only to select common headwords; the list itself is not bundled. The Vietnamese word list was used only for lexical validation; it is not bundled.

These exercises have been reformatted and transformed for Phở.fun learning activities. Automatic structural checks validate record shape, answer-option membership, unique identifiers, and tile consistency; they are not a substitute for a full human editorial review of every item.