Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hanh tranh » canh tranh, lanh tranh, nhanh thanh
hanh trang » thanh trung, canh tranh, minh trang
thong cong » trong cong, tong cong, thong thong
hieu xanh » chieu xanh, hieu manh, hieu nganh
cua thong » cua thuong, cua khong, cua tong
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cao » toan cao, thai cao, 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: doc hieu xanh - ((((hanh tranh) OR (hanh trinh))) or (hanh trang)) cua thong cong tan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - ((((hanh tranh) OR (hanh trinh))) OR (hanh trang)) cua thong cong tan than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - ((((hanh tranh) OR (hanh trinh))) or (hanh trang)) cua thong cong tan than cao".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - ((((hanh tranh) OR (hanh trinh))) or (hanh trang)) cua thong cong tan than cao*.