Perhaps you should try some spelling variations:
"cong trinh luan van thi cong van dong" » "cong trinh luat van thi cong van dong", "cong trinh han van thi cong van dong", "cong trinh toan van thi cong van dong", "cong trinh luan van tai cong van dong", "cong trinh luan van thien cong van dong", "cong trinh luan van thi cong vang dong", "cong trinh luan van thi cong san dong", "cong trinh luan van thi song van dong", "cong trinh luan dan thi cong van dong", "cong trinh luan van thu cong van dong"
"cong trinh quan doan thi cong thai cong" » "cong tinh quang doan thi cong thai cong", "cong trinh luat doan thi cong thai cong", "cong trinh han doan thi cong thai cong", "cong trinh quan hoang thi cong thai cong", "cong trinh chuan doan thi cong thai cong", "cong trinh chan doan thi cong thai cong", "cong trinh quan doan thi cong hai cong", "cong trinh quan doan thi hong thai cong", "cong trinh quan doan thi cong thanh cong", "cong trinh quan doan thi cong tai cong", "cong trinh quan doan thi cong thai son", "cong trinh quan doan tai cong thai cong", "cong trinh quan doan thien cong thai cong", "cong trinh quan dan thi cong thai cong", "cong trinh quan doanh tai cong thai cong"

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