Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
tien anh » tieng anh, tien manh, dien anh
luan han » luan hoan, luan phan, luan van
tong dan » tuong dan, thong dan, trong dan
dan toan » van toan, dan than, 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 (tien anh)) - hanh tang luan han tong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (tien anh)) - hanh tang luan han tong dan toan cau*.