Perhaps you should try some spelling variations:
"nhung thoi luan van. doi tuong hoi o" » "nhung thi luan van. doi tuong hoi o", "phung thi luan van. doi tuong hoi o", "nhung loi luan van. doi tuong hoi o", "nhung hoi luan van. doi tuong hoi o", "nhung thai luan van. doi tuong hoi o", "nhung thoi luan van. moi truong hoi o", "nhung thoi luan van. doi song hoi o", "nhung thoi luan van. doi truong hoi o", "nhung thoi luan van. doi tuong ho o", "nhung thoi luan van. doi duong hoi o", "nhung thoi luan van. doi tuong hoi co", "nhung thoi luan van. doi tuong hoi _", "nhung thoi luan van. doi tuong hoc o"
"nhung thon quyet van. noi dung hoc mo" » "nhung thanh quyet van. noi dung hoc mo", "chung thong quyet van. noi dung hoc mo", "nhung chong quyet van. noi dung hoc mo", "nhung theo quyet van. noi dung hoc mo", "nhung thon huyen van. noi dung hoc mo", "nhung thon quyet van. hoc dung hoc mo", "nhung thon quyet van. noi dong hoc mo", "nhung thon quyet van. noi dung thuoc mo", "nhung thon quyet van. noi trung hoc mo", "nhung thon quyet van. noi dung hoc moi", "nhung thon quyet van. noi dung hoc mot", "nhung thon quyet van. noi dung hoc mon"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("nhung thoi luan van. doi tuong hoi o") or ("nhung thon quyet van. noi dung hoc mo"))~.
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• Adding a wildcard symbol may retrieve word variants: (("nhung thoi luan van. doi tuong hoi o") or ("nhung thon quyet van. noi dung hoc mo"))*.