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 va. cho quan cua tap" » "phung thi xuan va. cho quan cua tap", "phung tri quan va. cho quan cua tap", "phung thi luan va. cho quan cua tap", "phung thi quan va. co quan cua tap", "phung thi quan va. che quan cua tap", "phung thi quan va. cao quan cua tap", "phung thi quan va. cho quan luan tap", "phung thi quan va. cho ban cua tap", "phung thi quan va. cho gian cua tap", "phung thi quan vi. cho quan cua tap", "phung thi quan ha. cho quan cua tap", "phung thi quan va. cho quan cua tam", "phung thi quan va. cho quan cua phap"

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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 va. cho quan cua tap"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("nhung thoi quyet van. thi nguyen luan lap") OR ("phung thi quan va. cho quan cua tap")).
• Removing quotes may allow a broader search: (( nhung thoi quyet van. thi nguyen luan lap ) or ( phung thi quan va. cho quan cua tap )).
• Adding a wildcard symbol may retrieve word variants: (("nhung thoi quyet van. thi nguyen luan lap") or ("phung thi quan va. cho quan cua tap"))*.