Perhaps you should try some spelling variations:
"nhung thoi quyet van. thi nguyen tan lap" » "nhung thi quyet van. thi nguyen tan lap", "nhung loi quyet van. thi nguyen tan lap", "nhung tri quyet van. thi nguyen tan lap", "nhung toi quyet van. thi nguyen tan lap", "nhung theo quyet van. thi nguyen tan lap", "nhung thoi quen van. thi nguyen tan lap", "nhung thoi quyet van. thai nguyen tan lap", "nhung thoi quyet van. tai nguyen tan lap", "nhung thoi quyet van. thi nguyet tan lap", "nhung thoi quyet van. thi nguyen tuan lap", "nhung thoi quyet van. thi nguyen van lap", "nhung thoi quyet van. thi nguyen can lap", "nhung thoi quyet van. thi nguyen toan lap", "nhung thoi quyet van. thi nguyen dan lap", "nhung thoi quyet van. thi nguyen tai lap"
"phung thi quan van. co gian cua tap" » "phung thi xuan van. co gian cua tap", "phung tri quan van. co gian cua tap", "phung thi luan van. co gian cua tap", "phung thi quan va. co gian cua tap", "phung thi quan luan. co gian cua tap", "phung thi quan van. co gian xu tap", "phung thi quan van. co ban cua tap", "phung thi quan van. con gian cua tap", "phung thi quan van. co giao cua tap", "phung thi quan van. co gia cua tap", "phung thi quan van. co gian cua tam", "phung thi quan van. co gian cua phap"

Try widening your search to All Fields.

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