Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien danh
trinh quan » tinh quang, trinh luat, trinh han
nhung cong » dung cong, thong cong, hang cong
thien anh » thien danh, tien anh, thien thanh
trinh cua » tinh cua, trinh luat, trinh luan
cong san » cong tac
san toan » van toan, dan toan, manh toan
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)) - hanh ((trinh cua) OR (trinh quan)) nhung cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (thien anh)) - hanh ((trinh cua) OR (trinh quan)) nhung cong san toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (thien anh)) - hanh ((trinh cua) OR (trinh quan)) nhung cong san toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (thien anh)) - hanh ((trinh cua) OR (trinh quan)) nhung cong san toan cau*.