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. cho quan cua tam" » "phung thi xuan van. cho quan cua tam", "phung tri quan van. cho quan cua tam", "phung thi luan van. cho quan cua tam", "phung thi quan va. cho quan cua tam", "phung thi quan luan. cho quan cua tam", "phung thi quan van. co quan cua tam", "phung thi quan van. che quan cua tam", "phung thi quan van. cao quan cua tam", "phung thi quan van. cho quan luan tam", "phung thi quan van. cho ban cua tam", "phung thi quan van. cho gian cua tam"

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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. cho quan cua tam"))~.
• 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. cho quan cua tam")).
• Removing quotes may allow a broader search: (( nhung thoi quyet van. thi nguyen tan lap ) or ( phung thi quan van. cho quan cua tam )).
• Adding a wildcard symbol may retrieve word variants: (("nhung thoi quyet van. thi nguyen tan lap") or ("phung thi quan van. cho quan cua tam"))*.