Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
cong thanh » cong trinh, truong thanh
dong thanh » truong thanh
hieu xanh » chieu xanh, hieu manh, hieu nganh
tranh cua » doanh cua, manh cua
doc hieu » toc thieu, hoc thieu, hoc hien
cua bang » chua bang, cua ban, cua dang
cong tan » cong tac, cong san, cong ty
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 xanh - hanh tranh cua bang ((((cong thanh) OR (dong thanh))) or (cong tan)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh tranh cua bang ((((cong thanh) OR (dong thanh))) OR (cong tan)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - hanh tranh cua bang ((((cong thanh) OR (dong thanh))) or (cong tan)) toan cau".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh tranh cua bang ((((cong thanh) OR (dong thanh))) or (cong tan)) toan cau*.