Perhaps you should try some spelling variations:
"dung thoi quen vang. noi cong hoa cong" » "dung thi quen vang. noi cong hoa cong", "dung toi quen vang. noi cong hoa cong", "dung thuoc quen vang. noi cong hoa cong", "dung thoi quan van. noi cong hoa cong", "dung thoi que van. noi cong hoa cong", "dung thoi que lang. noi cong hoa cong", "dung thoi quen vang. nguoi cong hoa cong", "dung thoi quen vang. tai cong hoa cong", "dung thoi quen vang. thi cong hoa cong", "dung thoi quen vang. noi dong hoa cong", "dung thoi quen vang. noi dong hoc cong", "dung thoi quen vang. noi hang hoa cong", "dung thoi quen vang. noi cong cua cong", "dung thoi quen vang. noi cong va cong", "dung thoi quen vang. noi cong hoa co"
"dung tren xe van. noi dung hoc mo" » "dung trong xe van. noi dung hoc mo", "dung trung xe van. noi dung hoc mo", "dung tren xe van. hoc dung hoc mo", "dung tren xe van. noi dong hoc mo", "dung tren xe van. noi dung thuoc mo", "dung tren xe van. noi trung hoc mo", "dung tren nen van. noi dung hoc mo", "dung tren le van. noi dung hoc mo", "dung tren ve van. noi dung hoc mo", "dung tren de van. noi dung hoc mo", "dung tren xe van. noi dung hoc moi", "dung tren xe van. noi dung hoc mot", "dung tren xe van. noi dung hoc mon"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("dung thoi quen vang. noi cong hoa cong") or ("dung tren xe van. noi dung hoc mo"))~.
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• Adding a wildcard symbol may retrieve word variants: (("dung thoi quen vang. noi cong hoa cong") or ("dung tren xe van. noi dung hoc mo"))*.