Perhaps you should try some spelling variations:
"tinh huong luan van hien hat" » "dinh huong luan van hien hat", "tinh quang luan van hien hat", "anh huong luan van hien hat", "tinh huong lan van hien hat", "tinh cuong luan van hien hat", "tinh huong loan van hien hat", "tinh huong luan van hieu hat", "tinh huong luan van tien hat", "tinh huong luan van dien hat", "tinh huong luan van thien hoat", "tinh huong luan van thien phat"
"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"

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