Perhaps you should try some spelling variations:
trinh thiet » trinh viet
luan doanh » luat doanh, luan danh, nhuan doanh
nguoi viec » nguoi viet, cuoi viec, nguoi tieu
trinh thi » trinh tai, dinh thi, trinh tu
doanh cua » doanh luan
viec khoa » vien khoa, viec khong, lieu khoa
vien than » vien thanh, dien than, vien nhan
khoa hoc » hoa hoc
dien dan » hien dai, vien dai, gian dan

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 thiet) OR (trinh thi)) luan doanh cua nguoi viec khoa hoc ((dien dan) or (vien than))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao ((trinh thiet) OR (trinh thi)) luan doanh cua nguoi viec khoa hoc ((dien dan) OR (vien than)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "giao ((trinh thiet) OR (trinh thi)) luan doanh cua nguoi viec khoa hoc ((dien dan) or (vien than))".
• Adding a wildcard symbol may retrieve word variants: giao ((trinh thiet) OR (trinh thi)) luan doanh cua nguoi viec khoa hoc ((dien dan) or (vien than))*.