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 quan van thi cong van dong", "cong trinh han 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 chan doan thi cong thai dong" » "cong trinh chuan doan thi cong thai dong", "cong trinh han doan thi cong thai dong", "cong trinh phan doan thi cong thai dong", "cong trinh chan doan thi cong hai dong", "cong trinh chan doan thi hong thai dong", "cong trinh chan doan thi cong thanh dong", "cong trinh chan doan thi cong thai cong", "cong trinh chan doan thi cong thai long", "cong trinh chan doan thi cong thai muong", "cong trinh chan doan tai cong thai dong", "cong trinh chan doan thien cong thai dong", "cong trinh chan dan thi cong thai dong", "cong trinh chan doanh tai cong thai dong", "cong trinh chan hoang thi cong thai dong"

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