Perhaps you should try some spelling variations:
"mau phieu phan tich su dung hoc" » "mau lieu phan tich su dung hoc", "mau hieu pham tich su dung hoc", "mau hieu phap tich su dung hoc", "mau chien phan tich su dung hoc", "mau phieu phan tich su dong hoc", "mau phieu phan tich su dung thuoc", "mau phieu phan tich su trung hoc", "mau phieu phan lich su dung hoc", "mau phieu phan tich du dung hoc", "mau phieu phan tich so dung hoc"
"mau dieu phan tich su dung hoc" » "mau dien phan tich su dung hoc", "mau lieu phan tich su dung hoc", "mau diem phan tich su dung hoc", "mau dieu phan tich su dong hoc", "mau dieu phan tich su dung thuoc", "mau dieu phan tich su trung hoc", "cau dieu phan tich su dung hoc", "dau dieu phan tich su dung hoc", "may dieu phan tich su dung hoc", "mau dieu phan lich su dung hoc", "mau dieu phan tich du dung hoc", "mau dieu phan tich so dung hoc"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("mau phieu phan tich su dung hoc") OR ("mau dieu phan tich su dung hoc"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"mau phieu phan tich su dung hoc\") OR (\"mau dieu phan tich su dung hoc\"))".
• Removing quotes may allow a broader search: (( mau phieu phan tich su dung hoc ) OR ( mau dieu phan tich su dung hoc )).
• Adding a wildcard symbol may retrieve word variants: (("mau phieu phan tich su dung hoc") OR ("mau dieu phan tich su dung hoc"))*.