Perhaps you should try some spelling variations:
"trinh dung luan van thien hoat" » "trinh dung luan van trien hoat", "trinh dung luan van thien thuat", "trinh dung luan van tien hoa", "trinh dung luan van tien hoat", "trinh dung luan van hien hoat", "trinh dung luan van chien hoat", "trinh dung quan van thien hoat"
"minh quang lan van kiem soat" » "tinh quang lan van kiem soat", "dinh quang lan van kiem soat", "minh hoang lan van kiem soat", "minh quang ban van kiem soat", "minh quang lam van kiem soat", "minh quang uan van kiem soat", "minh quang lan van kiem toan", "minh quang lan va kiem soat", "minh quang lan van kien soat", "minh quang lan van hieu soat", "minh quang lang van kiem soat", "minh quang tan van kiem soat", "minh quang san 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: (("minh quang lan van kiem soat") or ("trinh dung luan van thien hoat"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("minh quang lan van kiem soat") OR ("trinh dung luan van thien hoat")).
• Removing quotes may allow a broader search: (( minh quang lan van kiem soat ) or ( trinh dung luan van thien hoat )).
• Adding a wildcard symbol may retrieve word variants: (("minh quang lan van kiem soat") or ("trinh dung luan van thien hoat"))*.