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

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