Perhaps you should try some spelling variations:
trinh chuan » trinh han, trinh quan, trinh luan
thien thanh » tien thanh, thi thanh, hien hanh
trinh chua » trinh cua, trinh chu, tinh chua
bang cong » dang cong, bang song, hang cong
dien anh » tieng anh, dien dan
cong san » cong tac
san phan » san pham, van phan, sat phan
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien thanh) or (dien anh)) - hanh ((trinh chua) or (trinh chuan)) bang cong san phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien thanh) OR (dien anh)) - hanh ((trinh chua) OR (trinh chuan)) bang cong san phan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thien thanh) or (dien anh)) - hanh ((trinh chua) or (trinh chuan)) bang cong san phan cau*.