Perhaps you should try some spelling variations:
tdieu hanh » deu hanh, dieu danh, tiem hanh
hanh hang » thanh hang, hang hang, hanh han
va trong » va truong, va thong, va tuong
cong san » cong tac
san phan » san pham, van phan, sat phan
phan cau » phan dau, phan cac, phan tu
va tong » va thong, va tuong, va cong

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((tdieu hanh) or (dieu hanh)) - hanh hang ((va tong) OR (va trong)) cong san phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((tdieu hanh) OR (dieu hanh)) - hanh hang ((va tong) OR (va trong)) cong san phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((tdieu hanh) or (dieu hanh)) - hanh hang ((va tong) OR (va trong)) cong san phan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((tdieu hanh) or (dieu hanh)) - hanh hang ((va tong) OR (va trong)) cong san phan cau*.