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 van. thi duyen cua tap" » "phung thi quan van. thi huyen cua tap", "phung thi quan van. thi xuyen cua tap", "phung thi quan van. thi tuyen cua tap", "phung thi quan van. thi quyen cua tap", "phung thi quan van. thi truyen cua tap", "phung thi quan van. thi chuyen cua tap", "phung thi xuan van. thi duyen cua tap", "phung tri quan van. thi duyen cua tap", "phung thi luan van. thi duyen cua tap", "phung thi quan va. thi duyen cua tap", "phung thi quan luan. thi duyen cua tap", "phung thi quan van. thi duyen cua tam", "phung thi quan van. thi duyen 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 van. thi duyen 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 van. thi duyen cua tap")).
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• Adding a wildcard symbol may retrieve word variants: (("nhung thoi quyet van. thi nguyen luan lap") or ("phung thi quan van. thi duyen cua tap"))*.