Perhaps you should try some spelling variations:
thieu xanh » hieu manh, thien anh, thien danh
chieu xanh » chieu sach, chieu sang, chieu tinh
manh trung » manh tung, thanh trung, manh hung
nhung cong » thong cong, hang cong, nhung don
trung cam » trung tam, trung cap, trung nam
dung cong » dung trong
toan cao » toan ban, toan tap
ty toan » ly toan, tap toan, huy toan

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 (chieu xanh)) - manh trung cam ((nhung cong) OR (dung cong)) ty toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (chieu xanh)) - manh trung cam ((nhung cong) OR (dung cong)) ty toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (chieu xanh)) - manh trung cam ((nhung cong) OR (dung cong)) ty toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (chieu xanh)) - manh trung cam ((nhung cong) OR (dung cong)) ty toan cao*.