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 dieu phan tich su dung hoc", "mau phieu phan tich su dung thuoc", "mau phieu phan tich su trung hoc", "mau phieu phan tich su dung khoa", "mau phieu phan lich su dung hoc", "mau phieu phan tich du dung hoc", "mau phieu phan tich so dung hoc"
"mau phieu phan tich su dong hoc" » "mau lieu phan tich su dong hoc", "mau hieu pham tich su dong hoc", "mau hieu phap tich su dong hoc", "mau chien phan tich su dong hoc", "mau dieu phan tich su dong hoc", "mau phieu phan tich su dong co", "mau phieu phan tich su dong luc", "mau phieu phan lich su dong hoc", "mau phieu phan tich du dong hoc", "mau phieu phan tich so dong hoc", "mau phieu phan tich tu dong hoc", "mau phieu phan tich su dang hoc", "mau phieu phan tich su song hoc"

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