Perhaps you should try some spelling variations:
"nhung loi luan van. thoi quyet tu lap" » "nhung loi luan van. toi quyet tu lap", "nhung loi luan van. theo quyet tu lap", "nhung loi luan van. thoi quen tu lap", "nhung bai luan van. thoi quyet tu lap", "nhung bi luan van. thoi quyet tu lap", "nhung gi luan van. thoi quyet tu lap", "nhung li luan van. thoi quyet tu lap", "nhung hoi luan van. thoi quyet tu lap", "nhung loi lan van. thoi quyet tu lap", "nhung loi luan van. thoi quyet thu lap", "nhung loi luan van. thoi quyet thuc lap", "nhung loi luan van. thoi quyet tam lap", "nhung loi luan van. thoi quyet truc lap"
"nhung tri quet lang. thoi gian thu lap" » "nhung bai quet lang. thoi gian thu lap", "dung tri quet lang. thoi gian thu lap", "nhung bi quet lang. thoi gian thu lap", "nhung tri que lang. thoi gian thu lap", "nhung tri quan lang. thoi gian thu lap", "nhung tri biet lang. thoi gian thu lap", "nhung toi quyet lang. thoi gian thu lap", "nhung tri tue lang. thoi gian thu lap", "nhung tri quet lang. thoi gian thua lap", "nhung tri quet lang. thoi giang thu lap", "nhung tri quet lang. thoi gian phu lap", "nhung tri quet lang. thoi gian thu lao", "nhung tri quet lang. thoi gian thuat lap", "nhung tri quet lang. thoi gian thu nhap"

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