Perhaps you should try some spelling variations:
"nhung thoi qua quan. thoi quen tu lap" » "nhung thi qua quan. thoi quen tu lap", "phung thi qua quan. thoi quen tu lap", "nhung tri qua quan. thoi quen tu lap", "nhung hoi qua quan. thoi quen tu lap", "nhung thoi rua quan. thoi quen tu lap", "nhung thoi xua quan. thoi quen tu lap", "nhung thoi qua quan. thoi quen thu lap", "nhung thoi qua quan. thoi quen cua lap", "nhung thoi qua quan. thoi quen suc lap", "nhung thoi qua quan. thoi quen truc lap"
"nhung loi luan van. thon huyen tu lap" » "nhung loi luan van. thong huyen tu lap", "nhung loi luan van. thong chuyen tu lap", "nhung loi luan van. thanh huyen tu lap", "nhung bai luan van. thon huyen tu lap", "nhung bi luan van. thon huyen tu lap", "nhung gi luan van. thon huyen tu lap", "nhung li luan van. thon huyen tu lap", "nhung hoi luan van. thon huyen tu lap", "nhung loi lan van. thon huyen tu lap", "nhung loi luan van. thon chuyen tu lap", "nhung loi luan van. thon huyen tua lap", "nhung loi luan van. thon huyen vu lap", "nhung loi luan van. thon huyen truc lap"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("nhung loi luan van. thon huyen tu lap") or ("nhung thoi qua quan. thoi quen tu lap"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("nhung loi luan van. thon huyen tu lap") OR ("nhung thoi qua quan. thoi quen tu lap")).
• Removing quotes may allow a broader search: (( nhung loi luan van. thon huyen tu lap ) or ( nhung thoi qua quan. thoi quen tu lap )).
• Adding a wildcard symbol may retrieve word variants: (("nhung loi luan van. thon huyen tu lap") or ("nhung thoi qua quan. thoi quen tu lap"))*.