Perhaps you should try some spelling variations:
"nhung thi quyet van. thi nguyen lan lap" » "nhung thi quyet van. thai nguyen lan lap", "nhung thi quyet van. tai nguyen lan lap", "nhung thi quyet van. thi nguyet lan lap", "nhung thi quyet van. thi nguyen van lap", "nhung thi quyet van. thi nguyen can lap", "nhung thi quyet van. thi nguyen tan lap", "nhung thoi quyet van. thi nguyen lan lap", "nhung tri quyet van. thi nguyen lan lap", "nhung chi quyet van. thi nguyen lan lap", "nhung thi tuyet van. thi nguyen lan lap", "nhung toi quyet van. thi nguyen lan lap", "nhung theo quyet van. thi nguyen lan lap", "nhung thi quyet van. thi nguyen luan lap", "nhung thi quyet van. thi nguyen dan lap", "nhung thi quyet van. thi nguyen lan gap"
"phung thi quan van. co quan cua tap" » "phung thi xuan van. co quan cua tap", "phung tri quan van. co quan cua tap", "phung thi luan van. co quan cua tap", "phung thi quan va. co quan cua tap", "phung thi quan luan. co quan cua tap", "phung thi quan van. co quan luan tap", "phung thi quan van. co ban cua tap", "phung thi quan van. co gian cua tap", "phung thi quan van. co quan cua tam", "phung thi quan van. co quan cua phap"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("nhung thi quyet van. thi nguyen lan lap") or ("phung thi quan van. co quan cua tap"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("nhung thi quyet van. thi nguyen lan lap") OR ("phung thi quan van. co quan cua tap")).
• Removing quotes may allow a broader search: (( nhung thi quyet van. thi nguyen lan lap ) or ( phung thi quan van. co quan cua tap )).
• Adding a wildcard symbol may retrieve word variants: (("nhung thi quyet van. thi nguyen lan lap") or ("phung thi quan van. co quan cua tap"))*.