Perhaps you should try some spelling variations:
"nhung thoi quan van. nuoi dong luc mon" » "nhung thi quan van. nuoi dong luc mon", "nhung loi quan van. nuoi dong luc mon", "nhung tri quan van. nuoi dong luc mon", "nhung thoi quen van. nuoi dong luc mon", "nhung thong quan van. nuoi dong luc mon", "nhung thai quang van. nuoi dong luc mon", "nhung thoi quan van. nuoi duong luc mon", "nhung thoi quan van. nuoi ong luc mon", "nhung thoi quan van. nuoi trong luc mon", "nhung thoi luan van. nuoi dong luc mon", "nhung thoi quan va. nuoi dong luc mon", "nhung thoi quan luan. nuoi dong luc mon", "nhung thoi quan van. nuoi nang luc mon", "nhung thoi quan van. nuoi dong luc moi", "nhung thoi quan van. nuoi dong luc son", "nhung thoi quan van. nuoi dong luc cong"
"phung thi quan van. boi dung hoc mot" » "phung thi luan van. boi dung hoc mot", "phung thi quan va. boi dung hoc mot", "phung thi quan luan. boi dung hoc mot", "phung thi xuan van. boi dung hoc mot", "phung tri quan van. boi dung hoc mot", "phung thi quan van. boi duong hoc mot", "phung thi quan van. noi dung hoc mot", "phung thi quan van. hoi dung hoc mot", "phung thi quan van. boi dong hoc mot", "phung thi quan van. boi dung thuoc mot", "phung thi quan van. boi trung hoc mot", "phung thi quan van. boi dung hoc moi"

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