Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien danh
thuong dan » thuong han, thuong dam, thuong lan
thien anh » thien danh, tien anh, thien thanh
hanh sinh » hanh tinh, hanh dinh, hinh sinh
sinh cua » manh cua, dinh cuu, sinh va
cua tong » cua cong, cua dong, cua nong
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (thien anh)) - hanh sinh cua tong ((thuong dan) OR (huong dan)) toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (thien anh)) - hanh sinh cua tong ((thuong dan) OR (huong dan)) toan cao~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (thien anh)) - hanh sinh cua tong ((thuong dan) OR (huong dan)) toan cao*.