Perhaps you should try some spelling variations:
"nhung thoi qua van. hoi dong hoc mot" » "nhung thi qua van. hoi dong hoc mot", "phung thi qua van. hoi dong hoc mot", "nhung loi qua van. hoi dong hoc mot", "nhung hoi qua van. hoi dong hoc mot", "nhung thoi rua van. hoi dong hoc mot", "nhung thoi xua van. hoi dong hoc mot", "nhung thoi qua van. hop dong hoc mot", "nhung thoi qua van. hoat dong hoc mot", "nhung thoi qua van. ha dong hoc mot", "nhung thoi qua van. hoi dong co mot", "nhung thoi qua van. hoi dong luc mot", "nhung thoi qua ban. hoi dong hoc mot", "nhung thoi qua san. hoi dong hoc mot", "nhung thoi qua va. hoi dong hoc mot", "nhung thoi qua van. hoi dong hoc moi"
"chung thi quan van. noi dung hoi mot" » "phung thi quan van. noi dung hoi mot", "chung chi quan van. noi dung hoi mot", "nhung thi quan van. noi dung hoi mot", "chung thi xuan van. noi dung hoi mot", "chung tri quan van. noi dung hoi mot", "chung thi luan van. noi dung hoi mot", "chung thi quan va. noi dung hoi mot", "chung thi quan luan. noi dung hoi mot", "chung thi quan van. hoc dung hoi mot", "chung thi quan van. noi duong hoi mot", "chung thi quan van. noi dung hoai mot", "chung thi quan van. noi dung thoi mot", "chung thi quan van. noi dung hoa mot", "chung thi quan van. noi dung hop mot", "chung thi quan van. noi dung chon mot"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("chung thi quan van. noi dung hoi mot") or ("nhung thoi qua van. hoi dong hoc mot"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("chung thi quan van. noi dung hoi mot") OR ("nhung thoi qua van. hoi dong hoc mot")).
• Removing quotes may allow a broader search: (( chung thi quan van. noi dung hoi mot ) or ( nhung thoi qua van. hoi dong hoc mot )).
• Adding a wildcard symbol may retrieve word variants: (("chung thi quan van. noi dung hoi mot") or ("nhung thoi qua van. hoi dong hoc mot"))*.