Perhaps you should try some spelling variations:
"nhung thoi luan van. biet the hien gia thuc" » "nhung thi luan van. biet the hien gia thuc", "nhung loi luan van. biet the hien gia thuc", "nhung tri luan van. biet the hien gia thuc", "nhung hoi luan van. biet the hien gia thuc", "nhung thai luan van. biet the hien gia thuc", "nhung thoi luan van. biet the hien giam thuc", "nhung thoi luan van. biet the bien gia thuc", "nhung thoi luan van. biet the hieu gia thuc", "nhung thoi luan van. biet the hien va thuc", "nhung thoi luan van. biet the hien gia tac", "nhung thoi luan van. biet the hien gia muc"
"phung thi xuan ha. biet the hien cau truc" » "phung thi xa ha. biet the hien cau truc", "phung thi lan ha. biet the hien cau truc", "phung thi xuan ha. biet the khien cau truc", "phung thi xuan ha. biet the thien cau truc", "phung thi xuan ha. biet the hien cac truc", "phung thi quan ha. biet the hien cau truc", "phung thi xuan nhan. biet the hien cau truc", "phung thi quan hai. biet the hien cau truc"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("nhung thoi luan van. biet the hien gia thuc") or ("phung thi xuan ha. biet the hien cau truc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("nhung thoi luan van. biet the hien gia thuc") OR ("phung thi xuan ha. biet the hien cau truc")).
• Removing quotes may allow a broader search: (( nhung thoi luan van. biet the hien gia thuc ) or ( phung thi xuan ha. biet the hien cau truc )).
• Adding a wildcard symbol may retrieve word variants: (("nhung thoi luan van. biet the hien gia thuc") or ("phung thi xuan ha. biet the hien cau truc"))*.