Perhaps you should try some spelling variations:
"nhung bai que van. nuoi duong hoc mot" » "nhung bai que van. nguoi muong hoc mot", "nhung bai que van. boi duong hoc mot", "nhung bai que van. nguoi dung hoc mot", "nhung bai que van. nuoi dong hoc mot", "nhung bai que van. nuoi duong hoi mot", "nhung bai que van. nuoi duong ho mot", "nhung bai qua van. nuoi duong hoc mot", "nhung bai quy van. nuoi duong hoc mot", "nhung bai quyet van. nuoi duong hoc mot"
"nhung gia luan van. noi dung hoc moi" » "nhung gi luan van. noi dung hoc moi", "nhung bi luan van. noi dung hoc moi", "nhung gia tuan van. noi dung hoc moi", "nhung li luan van. noi dung hoc moi", "nhung hoa luan van. noi dung hoc moi", "nhung gia luan van. hoc dung hoc moi", "nhung gia luan van. noi dong hoc moi", "nhung gia luan van. noi dung thuoc moi", "nhung gia luan van. noi trung hoc moi", "nhung gia luan van. noi dung hoc noi"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("nhung bai que van. nuoi duong hoc mot") or ("nhung gia luan van. noi dung hoc moi"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("nhung bai que van. nuoi duong hoc mot") OR ("nhung gia luan van. noi dung hoc moi")).
• Removing quotes may allow a broader search: (( nhung bai que van. nuoi duong hoc mot ) or ( nhung gia luan van. noi dung hoc moi )).
• Adding a wildcard symbol may retrieve word variants: (("nhung bai que van. nuoi duong hoc mot") or ("nhung gia luan van. noi dung hoc moi"))*.