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

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