Search History Select to load keywords (subject equals "ผลสัมฤทธิ์ทางการเรียน") AND (subject equals "Academic achievement") AND (subject equals "Mathematics -- Study and teaching (Secondary)") AND (dateIssued equals "[2540 TO 2549]") AND (dateIssued equals "2549") AND (subject equals "High school students -- Thailand -- Trang") AND (subject equals "Activity programs in education")
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