Perhaps you should try some spelling variations:
"dung tri quan hanh. tac dung hoc moi" » "dung tri quan thanh. tac dung hoc moi", "dung tri quang thanh. tac dung hoc moi", "dung tri quang khanh. tac dung hoc moi", "dung tai quan hanh. tac dung hoc moi", "dung tren quan hanh. tac dung hoc moi", "dung sai quan hanh. tac dung hoc moi", "dung trinh quan hanh. tac dung hoc moi", "dung hai quan hanh. tac dung hoc moi", "dung mai quan hanh. tac dung hoc moi", "dung tri quan hanh. sach dung hoc moi", "dung tri quan hanh. xay dung hoc moi", "dung tri quan hanh. tin dung hoc moi", "dung tri quan hanh. tac dung thuoc moi", "dung tri quan hanh. tac trung hoc moi", "dung tri quan hanh. tac dung khoa moi", "dung tri quan hanh. tac dung hoc noi"
"dung thoi quan van. hoc dong hoc moi" » "dung thi quan van. hoc dong hoc moi", "dung toi quan van. hoc dong hoc moi", "dung thuoc quan van. hoc dong hoc moi", "dung thoi quen van. hoc dong hoc moi", "dung thong quan van. hoc dong hoc moi", "dung thoi luan van. hoc dong hoc moi", "dung thoi quan va. hoc dong hoc moi", "dung thoi quan luan. hoc dong hoc moi", "dung thoi quan van. hoc duong hoc moi", "dung thoi quan van. hoc cong hoc moi", "dung thoi quan van. hoc dung hoc moi", "dung thoi quan van. hoc dong co moi", "dung thoi quan van. hoc dong luc moi", "dung thoi quan van. hoc dong hoc noi"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("dung tri quan hanh. tac dung hoc moi") or ("dung thoi quan van. hoc dong hoc moi"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("dung tri quan hanh. tac dung hoc moi") OR ("dung thoi quan van. hoc dong hoc moi")).
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• Adding a wildcard symbol may retrieve word variants: (("dung tri quan hanh. tac dung hoc moi") or ("dung thoi quan van. hoc dong hoc moi"))*.