Perhaps you should try some spelling variations:
"nhung thoi quen vang. tai cong hoc mot" » "nhung thi quen vang. tai cong hoc mot", "phung thi quen vang. tai cong hoc mot", "nhung loi quen vang. tai cong hoc mot", "nhung thoi quan van. tai cong hoc mot", "nhung thoi que van. tai cong hoc mot", "nhung thoi que lang. tai cong hoc mot", "nhung thoi quen vang. tai dong hoc mot", "nhung thoi quen vang. tai cong hoa mot", "nhung thoi quen vang. tai cong coc mot", "nhung thoi quen vang. tai cong hoc moi"
"nhung bai luan van. moi trung hoc ma" » "nhung bai luan van. moi truong hoc ma", "nhung bai luan van. doi trung hoc ma", "nhung bai luan van. hoi trung hoc ma", "nhung bai luan van. moi trung quoc ma", "nhung bai toan van. moi trung hoc ma", "nhung li luan van. moi trung hoc ma", "nhung vay luan van. moi trung hoc ma"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("nhung thoi quen vang. tai cong hoc mot") or ("nhung bai luan van. moi trung hoc ma"))~.
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• Adding a wildcard symbol may retrieve word variants: (("nhung thoi quen vang. tai cong hoc mot") or ("nhung bai luan van. moi trung hoc ma"))*.