Perhaps you should try some spelling variations:
thieu xanh » hieu manh, thien anh, thien danh
chieu xanh » chieu sach, chieu sang, chieu tinh
khong cong » thong cong, khong cang, khong con
chong cong » cong cong, thong cong, cuong cong
lanh manh » lanh tranh, lan anh, van manh
manh cua » doanh cua, ban cua
san toan » van toan, dan toan, manh toan
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 (chieu xanh)) - lanh manh cua ((khong cong) OR (chong cong)) san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (chieu xanh)) - lanh manh cua ((khong cong) OR (chong cong)) san toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (chieu xanh)) - lanh manh cua ((khong cong) OR (chong cong)) san toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (chieu xanh)) - lanh manh cua ((khong cong) OR (chong cong)) san toan cao*.