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

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