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