Perhaps you should try some spelling variations:
"cong trinh luan van tai cong nhat luong" » "cong trinh luat van tai cong nhat luong", "cong trinh quan van tai cong nhat luong", "cong trinh toan van tai cong nhat luong", "cong trinh luan van tai cong chat luong", "cong trinh luan van tai cong nhat huong", "cong trinh luan van tai cong nhat thuong", "cong trinh luan van tai cong nhan luong", "cong trinh luan van tai cong ha luong", "cong trinh luan van tai dang nhat luong", "cong trinh luan von tai cong nhat luong", "cong trinh luan van tuan cong nhat luong"
"cong trinh han dan thi cong suat luong" » "cong trinh han dan thi cong suat huong", "cong trinh han dan thi cong chat luong", "cong trinh han dan thi cong suat thong", "cong trinh quan dan thi cong suat luong", "cong trinh han dan thi nang suat luong", "cong trinh han dan thi cong san luong", "cong trinh han dan thi cong cua luong", "cong trinh han dan thien cong suat luong", "cong trinh nhan dan thi cong suat luong", "cong trinh han danh thi cong suat luong", "cong trinh shan dan thi cong suat luong", "cong trinh han dang thi cong suat luong", "cong trinh han tran thi cong suat luong", "cong trinh han dinh thi cong suat luong"

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: (("cong trinh luan van tai cong nhat luong") or ("cong trinh han dan thi cong suat luong"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("cong trinh luan van tai cong nhat luong") OR ("cong trinh han dan thi cong suat luong")).
• Removing quotes may allow a broader search: (( cong trinh luan van tai cong nhat luong ) or ( cong trinh han dan thi cong suat luong )).
• Adding a wildcard symbol may retrieve word variants: (("cong trinh luan van tai cong nhat luong") or ("cong trinh han dan thi cong suat luong"))*.