Perhaps you should try some spelling variations:
"nhung thoi quen vang. con duong hoi mot" » "nhung thi quen vang. con duong hoi mot", "nhung loi quen vang. con duong hoi mot", "nhung tri quen vang. con duong hoi mot", "nhung thoi que van. con duong hoi mot", "nhung thoi que lang. con duong hoi mot", "nhung thoi quen hanh. con duong hoi mot", "nhung thoi quen vang. van duong hoi mot", "nhung thoi quen vang. con duong loi mot", "nhung thoi quen vang. con dong hoi mot", "nhung thoi quen vang. con duong noi mot", "nhung thoi quen vang. con duong hoc mot", "nhung thoi quen vang. con duong hoa mot", "nhung thoi quen vang. con duong hop mot"
"phung thi quan van. noi dung tai mot" » "phung thi xuan van. noi dung tai mot", "phung tri quan van. noi dung tai mot", "phung thi luan van. noi dung tai mot", "phung thi quan va. noi dung tai mot", "phung thi quan luan. noi dung tai mot", "phung thi quan van. hoc dung tai mot", "phung thi quan van. noi dung tri mot"

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