Perhaps you should try some spelling variations:
trinh than » trinh thanh, trinh han, trinh toan
hieu manh » chieu xanh, hieu nganh, hien hanh
chinh cua » chinh ca, chinh sua, hinh cua
hang cong » dang cong, hang nong, bang cong
cua hang » cua dang, cua nhung, cua cong
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) or (dieu hanh)) - hanh chinh cua hang cong trinh than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (dieu hanh)) - hanh chinh cua hang cong trinh than cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (dieu hanh)) - hanh chinh cua hang cong trinh than cau*.