Perhaps you should try some spelling variations:
trinh nghien » trinh nghe, kinh nghiem, trinh thiet
nghien quan » nghiep quan, nghiep luan, thien quan
quan manh » quang manh, quan hanh, quan thanh
viet khoa » vien khoa, viec khoa, viet khoang
dien phan » dien thanh, bien phap, hien phap
vien than » vien thanh, dien than, vien nhan
manh cua » doanh cua, ban cua
khoa hoc » hoa hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: giao trinh nghien quan manh cua nguoi viet khoa hoc ((dien phan) or (vien than))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao trinh nghien quan manh cua nguoi viet khoa hoc ((dien phan) OR (vien than)).
• Adding a wildcard symbol may retrieve word variants: giao trinh nghien quan manh cua nguoi viet khoa hoc ((dien phan) or (vien than))*.