Perhaps you should try some spelling variations:
"nhung tri quyet van. thoi nguyen cua lap" » "nhung tri quyet van. thai nguyen cua lap", "nhung tri quyet van. thi nguyen cua lap", "nhung tri quyet van. tuoi nguyen cua lap", "nhung tri quyet van. thoi nguyen cuu lap", "nhung tri quyet van. thoi nguyen xuan lap", "nhung tri quyet van. thoi nguyen tuan lap", "nhung bai quyet van. thoi nguyen cua lap", "dung tri quyet van. thoi nguyen cua lap", "nhung bi quyet van. thoi nguyen cua lap", "nhung toi quyet van. thoi nguyen cua lap", "nhung thi tuyet van. thoi nguyen cua lap", "nhung tri quyet van. thoi nguyen chua lap", "nhung tri quyet van. thoi nguyen cua tap", "nhung tri quyet van. thoi nguyen cua lao"
"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 tri quyet van. thoi nguyen cua lap") or ("phung thi luan van. thoi quen cua lam"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("nhung tri quyet van. thoi nguyen cua lap") OR ("phung thi luan van. thoi quen cua lam")).
• Removing quotes may allow a broader search: (( nhung tri quyet van. thoi nguyen cua lap ) or ( phung thi luan van. thoi quen cua lam )).
• Adding a wildcard symbol may retrieve word variants: (("nhung tri quyet van. thoi nguyen cua lap") or ("phung thi luan van. thoi quen cua lam"))*.