Perhaps you should try some spelling variations:
"nhung thoi quyet van. thi nguyen cuu lap" » "nhung thi quyet van. thi nguyen cuu lap", "nhung loi quyet van. thi nguyen cuu lap", "nhung tri quyet van. thi nguyen cuu lap", "nhung toi quyet van. thi nguyen cuu lap", "nhung theo quyet van. thi nguyen cuu lap", "nhung thi tuyet van. thi nguyen cuu lap", "nhung thoi quyet van. thai nguyen cuu lap", "nhung thoi quyet van. tai nguyen cuu lap", "nhung thoi quyet van. thi nguyet cuu lap", "nhung thoi quyet van. thi nguyen huu lap", "nhung thoi quyet van. thi nguyen luu lap", "nhung thoi quyet van. thi nguyen cua lap", "nhung thoi quyet van. thi nguyen cuu ap", "nhung thoi quyet van. thi nguyen cuu lam", "nhung thoi quyet van. thi nguyen chua lap"
"phung thi luan van. thoi quen cua lam" » "phung thi lan van. thoi quen cua lam", "phung thi xuan van. thoi quen cua lam", "phung thi loan van. thoi quen cua lam", "phung thi luan van. thoi quyen cua lam", "phung thi luan van. thoi quan cua lam", "phung thi luan van. thoi duyen cua lam", "phung thi luan van. thoi quen cua tam", "phung thi luan van. thoi quen cua nam", "phung thi luan van. thoi quen cua am"

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