Perhaps you should try some spelling variations:
"phung trinh quan van. biet the hieu van duy" » "phuong trinh quan van. biet the hieu van duy", "chuong trinh quan van. biet the hieu van duy", "hung thinh quan van. biet the hieu van duy", "phung tinh quang van. biet the hieu van duy", "phung trinh luat van. biet the hieu van duy", "phung trinh han van. biet the hieu van duy", "phung trinh quan va. biet the hieu van duy", "phung trinh quan luan. biet the hieu van duy", "phung trinh quan doan. biet the hieu van duy", "phung trinh quan van. biet the hieu va duy", "phung trinh quan van. biet the thien van duy", "phung trinh quan van. biet the lieu va duy", "phung trinh quan van. biet the hieu van dung"
"phung thi luan van. biet the hien cam xuc" » "phung thi lan van. biet the hien cam xuc", "phung thi xuan van. biet the hien cam xuc", "phung thi loan van. biet the hien cam xuc", "phung thi luan van. biet the hien cac xuc", "phung thi luan van. biet the hien cau xuc", "phung thi luan van. biet the hien giam xuc"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("phung trinh quan van. biet the hieu van duy") or ("phung thi luan van. biet the hien cam xuc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("phung trinh quan van. biet the hieu van duy") OR ("phung thi luan van. biet the hien cam xuc")).
• Removing quotes may allow a broader search: (( phung trinh quan van. biet the hieu van duy ) or ( phung thi luan van. biet the hien cam xuc )).
• Adding a wildcard symbol may retrieve word variants: (("phung trinh quan van. biet the hieu van duy") or ("phung thi luan van. biet the hien cam xuc"))*.