Perhaps you should try some spelling variations:
"nhung hoi cua van. thoi nguyen tuan lap" » "nhung hoi cua van. thai nguyen tuan lap", "nhung hoi cua van. thi nguyen tuan lap", "nhung hoi cua van. tuoi nguyen tuan lap", "nhung hoi cua van. thoi nguyen xuan lap", "nhung hoi cua van. thoi nguyen thanh lap", "nhung hoi cua van. thoi nguyen quang lap", "nhung thoi cua van. thoi nguyen tuan lap", "nhung loi cua van. thoi nguyen tuan lap", "nhung noi cua van. thoi nguyen tuan lap", "nhung hoi cua van. thoi nguyen toan lap", "nhung hoi cua van. thoi nguyen quan lap", "nhung hoi cua van. thoi nguyen luan lap", "nhung hoi chuc van. thoi nguyen tuan lap", "nhung hoi cua ban. thoi nguyen tuan lap", "nhung hoi cua vat. thoi nguyen tuan lap", "nhung hoi cua dan. thoi nguyen tuan lap"
"phung thi quan luan. thoi quen cua lap" » "phung thi xuan luan. thoi quen cua lap", "phung tri quan luan. thoi quen cua lap", "phung thi luan luan. thoi quen cua lap", "phung thi quan luan. thoi quyen cua lap", "phung thi quan luan. thoi quan cua lap", "phung thi quan luan. thoi duyen cua lap", "phung thi quan luan. thoi quen chua lap", "phung thi quan luan. thoi quen cua tap", "phung thi quan luan. thoi quen cua lam"

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