Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu nganh » vien nganh, hiem ngan, nghiep nganh
cong thanh » dong thanh, cong trinh, cong tan
hieu manh » chieu xanh, dieu hanh, hien hanh
trung tan » trung tuan, trung tran, trung tang
dung cong » dung trong
tan dung » tran dung, tin dung, van dung
toan cau » toan ban, toan tap, toan tai
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 (hieu nganh)) - thanh trung tan dung cong thanh ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu manh) OR (hieu nganh)) - thanh trung tan dung cong thanh ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu manh) OR (hieu nganh)) - thanh trung tan dung cong thanh ((toan cau) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu manh) OR (hieu nganh)) - thanh trung tan dung cong thanh ((toan cau) or (toan cao))*.