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

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