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

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