Perhaps you should try some spelling variations:
"nhung tri qua van. thoi nguyen chua lap" » "nhung tri qua van. thai nguyen chua lap", "nhung tri qua van. thi nguyen chua lap", "nhung tri qua van. tuoi nguyen chua lap", "nhung tri qua van. thoi nguyen cua lap", "nhung tri qua van. thoi nguyen thuan lap", "nhung tri qua van. thoi nguyen huu lap", "nhung bai qua van. thoi nguyen chua lap", "dung tri qua van. thoi nguyen chua lap", "nhung bi qua van. thoi nguyen chua lap", "nhung tri qua van. thoi nguyen chua tap", "nhung tri qua van. thoi nguyen thuat lap", "nhung tri qua van. thoi nguyen chua lanh", "nhung tri quan van. thoi nguyen chua lap", "nhung tri cua van. thoi nguyen chua lap", "nhung tri sua van. thoi nguyen chua lap", "nhung tri qua ban. thoi nguyen chua lap", "nhung tri qua san. thoi nguyen chua lap"
"phung thi luan van. thoi quen cua tap" » "phung thi lan van. thoi quen cua tap", "phung thi xuan van. thoi quen cua tap", "phung thi loan van. thoi quen cua tap", "phung thi luan van. thoi quyen cua tap", "phung thi luan van. thoi quan cua tap", "phung thi luan van. thoi duyen cua tap", "phung thi luan van. thoi quen cua tam", "phung thi luan van. thoi quen cua phap"

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