Perhaps you should try some spelling variations:
thanh trung » thanh tung
khong cong » thong cong, khong cang, chong cong
trinh toan » tinh toan, thanh toan, trinh han
hieu manh » chieu xanh, hieu nganh, hien hanh
trung ha » trung hoc, trung tam, trung cap
ha khong » hoa khong, hay khong, hua khong
toan cau » toan cao, toan ban, toan tap

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

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