Perhaps you should try some spelling variations:
"trinh dung luan van hieu suat" » "trinh dung luan van hieu luat", "trinh dung luan van hieu qua", "trinh dung luan cao hieu suat", "trinh dung lan van hieu suat"
"tinh quan quan bi kiem soat" » "tinh quang quan bi kiem soat", "trinh quan quan bi kiem soat", "tin quan quan bi kiem soat", "tinh quan quang bi kiem soat", "tinh qua quan bi kiem soat", "tinh quan luan bi kiem soat", "tinh quan quan bi kiem toan", "tinh quan quan li kiem soat", "tinh quan quan vi kiem soat", "tinh quan quan ba kiem soat", "tinh quan quan bi viem soat", "tinh quan quan thi kiem soat", "tinh quan quan tim kiem soat"

You may be able to get more results by adjusting your search query.

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