Perhaps you should try some spelling variations:
trinh trien » trinh triet, trinh tren, trinh tien
trien quang » tran quang, tuyen quang, dien quang
quang dinh » quang ninh, quang binh, quang minh
viet khoa » vien khoa, viec khoa, viet khoang
dien than » dien thanh, dien toan, dien phan
vien than » vien thanh, vien nhan, viet thanh
dinh cua » dinh cuu, sinh cua, dinh cu
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 trien quang dinh cua nguoi viet khoa hoc ((dien than) or (vien than))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao trinh trien quang dinh cua nguoi viet khoa hoc ((dien than) OR (vien than)).
• Adding a wildcard symbol may retrieve word variants: giao trinh trien quang dinh cua nguoi viet khoa hoc ((dien than) or (vien than))*.