Perhaps you should try some spelling variations:
"nhung loi quen hanh. tac dung thuoc ma" » "nhung bai quen hanh. tac dung thuoc ma", "nhung bi quen hanh. tac dung thuoc ma", "nhung gi quen hanh. tac dung thuoc ma", "nhung loi quen thanh. tac dung thuoc ma", "nhung loi quan hanh. tac dung thuoc ma", "nhung loi quang hanh. tac dung thuoc ma", "nhung loi que hanh. tac dung thuoc ma", "nhung thoi quen hanh. tac dung thuoc ma", "nhung moi quan hanh. tac dung thuoc ma", "nhung loi quen hanh. sach dung thuoc ma", "nhung loi quen hanh. xay dung thuoc ma", "nhung loi quen hanh. tin dung thuoc ma", "nhung loi quen hanh. tac dung hoc ma", "nhung loi quen hanh. tac dung duoc ma"
"nhung tri luan van. noi trung quoc mo" » "nhung bai luan van. noi trung quoc mo", "dung tri luan van. noi trung quoc mo", "nhung bi luan van. noi trung quoc mo", "nhung tri luan van. doi trung quoc mo", "nhung tri luan van. nhi trung quoc mo", "nhung tri luan van. hoi trung quoc mo", "nhung tri quan van. noi trung quoc mo", "nhung thi luan van. noi trung quoc mo", "nhung tri tuan van. noi trung quoc mo", "nhung tri luan van. noi trung uoc mo", "nhung tri luan van. noi trung quoc co", "nhung tri luan van. noi trung quoc lo"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("nhung loi quen hanh. tac dung thuoc ma") or ("nhung tri luan van. noi trung quoc mo"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("nhung loi quen hanh. tac dung thuoc ma") OR ("nhung tri luan van. noi trung quoc mo")).
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• Adding a wildcard symbol may retrieve word variants: (("nhung loi quen hanh. tac dung thuoc ma") or ("nhung tri luan van. noi trung quoc mo"))*.