Perhaps you should try some spelling variations:
"cong trinh luan van thi dung va luong" » "cong trinh luat van thi dung va luong", "cong trinh quan van thi dung va luong", "cong trinh han van thi dung va luong", "cong trinh luan van thi huong va luong", "cong trinh luan van thi nhung va luong", "cong trinh luan van thi cong va luong", "cong trinh luan van thi dung van luong", "cong trinh luan van thi dung va tuong", "cong trinh luan van thi dung va huong", "cong trinh luan van tai dung va luong", "cong trinh luan van thu dung va luong", "cong trinh luan tran thi dung va luong"
"cong trinh luan dan thi dong va luong" » "cong trinh luat dan thi dong va luong", "cong trinh quan dan thi dong va luong", "cong trinh han dan thi dong va luong", "cong trinh luan dan thi dong van luong", "cong trinh luan dan thi dong va tuong", "cong trinh luan dan thi dong va huong", "cong trinh luan danh thi dong va luong", "cong trinh luan san thi dong va luong", "cong trinh luan dan thai dong va luong", "cong trinh luan dan thi cong va luong", "cong trinh luan dan thi hong va luong", "cong trinh luan dang thi dong va luong", "cong trinh luan tran thi dong va luong", "cong trinh luan dinh thi dong va luong", "cong trinh luan dan thi dong ha luong", "cong trinh luan dan thi luong va luong", "cong trinh luan dan thi dong hoa 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 thi dung va luong") or ("cong trinh luan dan thi dong va luong"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("cong trinh luan van thi dung va luong") OR ("cong trinh luan dan thi dong va luong")).
• Removing quotes may allow a broader search: (( cong trinh luan van thi dung va luong ) or ( cong trinh luan dan thi dong va luong )).
• Adding a wildcard symbol may retrieve word variants: (("cong trinh luan van thi dung va luong") or ("cong trinh luan dan thi dong va luong"))*.