Perhaps you should try some spelling variations:
"nhung bi quen hanh. nguoi tong ung mo" » "nhung bi quen hanh. nguoi thong ung mo", "nhung bi quen hanh. nguoi trong ung mo", "nhung bi quen hanh. nguoi cong ung mo", "nhung bi quen thanh. nguoi tong ung mo", "nhung bi quan hanh. nguoi tong ung mo", "nhung bi quang hanh. nguoi tong ung mo", "nhung bai quen hanh. nguoi tong ung mo", "nhung gi quen hanh. nguoi tong ung mo", "nhung bi quen hanh. nguoi tong cong mo", "nhung bi quen hanh. nguoi huong ung mo", "nhung bi quen hanh. nguoi cong dung mo", "nhung bi quyet hanh. nguoi tong ung mo", "nhung si quyen hanh. nguoi tong ung mo", "nhung bi quen hanh. nguoi tong dung mo", "nhung bi quen hanh. nguoi tong ung co", "nhung bi quen hanh. nguoi tong ung ho"
"dung tren luan van. hoc dung noi bo" » "dung trong luan van. hoc dung noi bo", "dung trung luan van. hoc dung noi bo", "dung trinh luan van. hoc dung noi bo", "dung tranh luan van. hoc dung noi bo", "dung thien luan van. hoc dung noi bo", "dung tren luan van. hoc ung noi bo", "dung tren luan van. hoc dan noi bo", "dung tren luan van. tac dung noi bo", "dung tren luan van. hoc duong noi bo", "dung tren luan van. hoc dung doi bo", "dung tren luan van. hoc dung moi bo"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("nhung bi quen hanh. nguoi tong ung mo") or ("dung tren luan van. hoc dung noi bo"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("nhung bi quen hanh. nguoi tong ung mo") OR ("dung tren luan van. hoc dung noi bo")).
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• Adding a wildcard symbol may retrieve word variants: (("nhung bi quen hanh. nguoi tong ung mo") or ("dung tren luan van. hoc dung noi bo"))*.