Perhaps you should try some spelling variations:
"nhung thong quan van. hoc dung thu cong" » "chung thong quan van. hoc dung thu cong", "nhung chong quan van. hoc dung thu cong", "nhung phong quan van. hoc dung thu cong", "nhung thong quan va. hoc dung thu cong", "nhung thong quan luan. hoc dung thu cong", "nhung thong quan doan. hoc dung thu cong", "nhung thong quan van. hoc ung thu cong", "nhung thong quan van. hoc dan thu cong", "nhung thong quan van. tac dung thu cong", "nhung thong quan van. hoc dung phu cong", "nhung thong quan van. hoc dung thi cong"
"nhung noi luan van. tac trung quoc mo" » "nhung loi luan van. tac trung quoc mo", "nhung nguoi luan van. tac trung quoc mo", "nhung nghi luan van. tac trung quoc mo", "nhung noi luan van. trac trung quoc mo", "nhung noi luan van. tai trung quoc mo", "nhung noi luan van. tac trong quoc mo", "nhung hoi luan van. tac trung quoc mo", "nhung noi quan van. tac trung quoc mo", "nhung nuoc luan van. tac trung quoc mo", "nhung noi luan van. tac trung uoc mo", "nhung noi luan van. tac trung quoc co", "nhung noi luan van. tac trung quoc lo"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("nhung thong quan van. hoc dung thu cong") or ("nhung noi luan van. tac trung quoc mo"))~.
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• Adding a wildcard symbol may retrieve word variants: (("nhung thong quan van. hoc dung thu cong") or ("nhung noi luan van. tac trung quoc mo"))*.