Perhaps you should try some spelling variations:
"tinh huong luan van tien soat" » "dinh huong luan van tien soat", "tinh quang luan van tien soat", "anh huong luan van tien soat", "tinh huong lan van tien soat", "tinh cuong luan van tien soat", "tinh huong loan van tien soat", "tinh huong luan van trien hoat", "tinh huong luan van thien hoat", "tinh huong luan van tien hoa", "tinh huong luan toan tien soat", "tinh huong luan van hieu soat", "tinh huong luan van tuan soat"
"trinh dung lan va kiem soat" » "trinh dung lan va kiem toan", "trinh dung luan va kiem soat", "trinh dung land va kiem soat", "trinh dung lam va kiem soat", "trinh dung lan van kien soat", "trinh dung lanh va kiem soat", "trinh dung lan van kiem 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 lan va kiem soat") or ("tinh huong luan van tien soat"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("trinh dung lan va kiem soat") OR ("tinh huong luan van tien soat")).
• Removing quotes may allow a broader search: (( trinh dung lan va kiem soat ) or ( tinh huong luan van tien soat )).
• Adding a wildcard symbol may retrieve word variants: (("trinh dung lan va kiem soat") or ("tinh huong luan van tien soat"))*.