Perhaps you should try some spelling variations:
"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 hoi mot", "nhung thoi luan van. boi duong hoc moi"
"nhung chi qua van. noi dung thoi mo" » "chung chi qua van. noi dung thoi mo", "nhung chu qua van. noi dung thoi mo", "nhung thi qua van. noi dung thoi mo", "nhung chi qua van. noi dung thi mo", "nhung chi qua van. noi dung toi mo", "nhung chi qua van. noi dung thuoc mo", "nhung chi qua van. hoc dung thoi mo", "nhung chi cua van. noi dung thoi mo", "nhung cho qua van. noi dung thoi mo", "nhung phi quan van. noi dung thoi mo", "nhung chi quan van. noi dung thoi mo", "nhung chi qua ban. noi dung thoi mo", "nhung chi qua san. noi dung thoi mo", "nhung chi qua van. noi dung thong mo", "nhung chi qua van. noi dung thoai me"

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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 qua van. noi dung thoi 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 qua van. noi dung thoi mo")).
• Removing quotes may allow a broader search: (( nhung thoi luan van. boi duong hoc mot ) or ( nhung chi qua van. noi dung thoi mo )).
• Adding a wildcard symbol may retrieve word variants: (("nhung thoi luan van. boi duong hoc mot") or ("nhung chi qua van. noi dung thoi mo"))*.