Perhaps you should try some spelling variations:
"tinh huong quan vi kiem soat" » "dinh huong quan vi kiem soat", "tinh quang quan vi kiem soat", "anh huong quan vi kiem soat", "tinh luong quan vi kiem soat", "tinh cuong quan vi kiem soat", "tinh vuong quan vi kiem soat", "tinh huong quan vi kiem toan", "tinh huong quan li kiem soat", "tinh huong quan tri kiem soat", "tinh huong quan doi kiem soat", "tinh huong quan va kiem soat", "tinh huong quan bi kiem soat", "tinh huong quan ve kiem soat"
"trinh dung luan van hieu soat" » "trinh dung luan van hieu suat", "trinh dung luan van hieu hoat", "trinh dung luan van hieu luat", "trinh dung luan cao hieu soat", "trinh dung lan van hieu soat"

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: (("trinh dung luan van hieu soat") or ("tinh huong quan vi kiem soat"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("trinh dung luan van hieu soat") OR ("tinh huong quan vi kiem soat")).
• Removing quotes may allow a broader search: (( trinh dung luan van hieu soat ) or ( tinh huong quan vi kiem soat )).
• Adding a wildcard symbol may retrieve word variants: (("trinh dung luan van hieu soat") or ("tinh huong quan vi kiem soat"))*.