Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
cua thuong » cua truong, cua phuong, cua huong
hoc thieu » toc thieu, hoc hien
ca thuong » cao thuong, va thuong, cp thuong
ho chieu » theo chieu, doi chieu, mot chieu
toan tap » toan ban
tap than » tap thanh, tap toan, tam than
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (hoc thieu)) xanh - thanh tuong ((cua thuong) OR (ca thuong)) toan tap than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) xanh - thanh tuong ((cua thuong) OR (ca thuong)) toan tap than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (hoc thieu)) xanh - thanh tuong ((cua thuong) OR (ca thuong)) toan tap than cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc thieu)) xanh - thanh tuong ((cua thuong) OR (ca thuong)) toan tap than cau*.