Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien danh
cong thanh » dong thanh, cong trinh, truong thanh
thien anh » thien danh, tien anh, thien thanh
anh tang » anh bang, anh dang, anh nang
tang cua » mang cua, hang cua, tang luan
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: hoc ((thieu xanh) or (thien anh)) - anh tang cua cong ((cong thanh) OR (cong tan)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (thien anh)) - anh tang cua cong ((cong thanh) OR (cong tan)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (thien anh)) - anh tang cua cong ((cong thanh) OR (cong tan)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (thien anh)) - anh tang cua cong ((cong thanh) OR (cong tan)) toan cau*.