Perhaps you should try some spelling variations:
"nhung chi quyet van. nguoi duong hoi mo" » "nhung chi quyet van. nguoi muong hoi mo", "nhung chi quyet van. nguoi dung hoi mo", "nhung chi quyet van. nuoi duong hoi mo", "chung chi quyet van. nguoi duong hoi mo", "nhung chu quyet van. nguoi duong hoi mo", "nhung thi quyet van. nguoi duong hoi mo", "nhung khai quyet van. nguoi duong hoi mo", "nhung bi quyet van. nguoi duong hoi mo", "nhung thi tuyet van. nguoi duong hoi mo", "nhung chi quyet van. nguoi duong loi mo", "nhung chi quyet van. nguoi dong hoi mo", "nhung chi quyet van. nguoi duong noi mo", "nhung chi quyet van. nguoi duong hoi mot", "nhung chi quyet van. nguoi duong hoi co", "nhung chi quyet van. nguoi duong hoi o"
"nhung thoi luan van. boi duong hoc mot" » "nhung thi luan van. boi duong hoc mot", "phung thi luan van. boi duong hoc mot", "nhung loi luan van. boi duong hoc mot", "nhung hoi luan van. boi duong hoc mot", "nhung thai luan van. boi duong hoc mot", "nhung thoi luan van. hai duong hoc mot", "nhung thoi luan van. doi tuong hoc mot", "nhung thoi luan van. con duong hoc mot", "nhung thoi luan van. boi dong hoc mot", "nhung thoi luan van. boi dung hoc mot", "nhung thoi luan van. boi duong ho mot", "nhung thoi luan van. boi duong hoc moi"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("nhung thoi luan van. boi duong hoc mot") or ("nhung chi quyet van. nguoi duong hoi mo"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("nhung thoi luan van. boi duong hoc mot") OR ("nhung chi quyet van. nguoi duong hoi mo")).
• Removing quotes may allow a broader search: (( nhung thoi luan van. boi duong hoc mot ) or ( nhung chi quyet van. nguoi duong hoi mo )).
• Adding a wildcard symbol may retrieve word variants: (("nhung thoi luan van. boi duong hoc mot") or ("nhung chi quyet van. nguoi duong hoi mo"))*.