Perhaps you should try some spelling variations:
"vien luong luan van hieu suat" » "tien luong luan van hieu suat", "hien luong luan van hieu suat", "vien truong luan van hieu suat", "vien luong quan van hieu suat", "vien luong xuan van hieu suat", "vien cuong luan van hieu suat", "vien luong luan van hieu luat", "vien luong luan van hieu qua", "vien luong luan cao hieu suat"
"tinh quang tuan va kiem soat" » "tinh quang thanh va kiem soat", "tinh quan luan va kiem soat", "tinh quang cua va kiem soat", "tinh quang tuan va kiem toan", "tinh quang toan va kiem soat", "tinh quang luan va kiem soat", "tinh quang quan va kiem soat", "tinh quang tuan van kien soat"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("vien luong luan van hieu suat") or ("tinh quang tuan va kiem soat"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("vien luong luan van hieu suat") OR ("tinh quang tuan va kiem soat")).
• Removing quotes may allow a broader search: (( vien luong luan van hieu suat ) or ( tinh quang tuan va kiem soat )).
• Adding a wildcard symbol may retrieve word variants: (("vien luong luan van hieu suat") or ("tinh quang tuan va kiem soat"))*.