Perhaps you should try some spelling variations:
"nhung thoi quyet van. bi dong hoc mo" » "nhung thi quyet van. bi dong hoc mo", "phung thi quyet van. bi dong hoc mo", "nhung loi quyet van. bi dong hoc mo", "nhung toi quyet van. bi dong hoc mo", "nhung theo quyet van. bi dong hoc mo", "nhung thoi quen van. bi dong hoc mo", "nhung thoi quyet van. bi dong co mo", "nhung thoi quyet van. bi dong luc mo", "nhung thoi quyet van. bi cong hoc mo", "nhung thoi quyet van. di dong hoc mo", "nhung thoi quyet van. bien dong hoc mo", "nhung thoi quyet van. bi dong hoc moi", "nhung thoi quyet van. bi dong hoc mon", "nhung thoi quyet van. bi dong hoc ma"
"nhung thoi luan van. boi dung hoc mot" » "nhung thi luan van. boi dung hoc mot", "phung thi luan van. boi dung hoc mot", "nhung loi luan van. boi dung hoc mot", "nhung hoi luan van. boi dung hoc mot", "nhung thai luan van. boi dung hoc mot", "nhung thoi luan van. boi duong hoc mot", "nhung thoi luan van. noi dung hoc mot", "nhung thoi luan van. hoi dung hoc mot", "nhung thoi luan van. boi dung thuoc mot", "nhung thoi luan van. boi trung hoc mot", "nhung thoi luan van. boi dung khoa mot", "nhung thoi luan van. boi dung hoc moi", "nhung thoi luan van. boi dung hoc moit", "nhung thoi luan van. boi dung hoc mont", "nhung thoi luan van. boi dung hoc mat"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("nhung thoi quyet van. bi dong hoc mo") or ("nhung thoi luan van. boi dung hoc mot"))~.
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• Adding a wildcard symbol may retrieve word variants: (("nhung thoi quyet van. bi dong hoc mo") or ("nhung thoi luan van. boi dung hoc mot"))*.