Perhaps you should try some spelling variations:
"nhung thoi quyet van. thi nguyen luan lap" » "nhung thoi quyet van. thi nguyen xuan lap", "nhung thoi quyet van. thi nguyen tuan lap", "nhung thoi quyet van. thi nguyen lan lap", "nhung thi quyet van. thi nguyen luan lap", "nhung loi quyet van. thi nguyen luan lap", "nhung tri quyet van. thi nguyen luan lap", "nhung toi quyet van. thi nguyen luan lap", "nhung theo quyet van. thi nguyen luan lap", "nhung thoi quen van. thi nguyen luan lap", "nhung thoi quyet van. thai nguyen luan lap", "nhung thoi quyet van. tai nguyen luan lap", "nhung thoi quyet van. thi nguyet luan lap", "nhung thoi quyet van. thi nguyen quan lap", "nhung thoi quyet van. thi nguyen luan van", "nhung thoi quyet van. thi nguyen phan lap"
"phung thi quan van. cho quyen cua tam" » "phung thi quan van. chu quyen cua tam", "phung thi quan van. cao quyen cua tam", "phung thi quan van. cho tuyen cua tam", "phung thi quan van. cho duyen cua tam", "phung thi quan van. cho quen cua tam", "phung thi quan van. cho truyen cua tam", "phung thi xuan van. cho quyen cua tam", "phung tri quan van. cho quyen cua tam", "phung thi luan van. cho quyen cua tam", "phung thi quan va. cho quyen cua tam", "phung thi quan luan. cho quyen cua tam"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("nhung thoi quyet van. thi nguyen luan lap") or ("phung thi quan van. cho quyen cua tam"))~.
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• Adding a wildcard symbol may retrieve word variants: (("nhung thoi quyet van. thi nguyen luan lap") or ("phung thi quan van. cho quyen cua tam"))*.