Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thanh tinh » thanh binh, nhanh tinh, than kinh
cao thuong » cao truong, ca thuong, chan thuong
cho thuong » cho truong, cho chuong, cho huong
hoc thieu » toc thieu, hoc hien
tan toan » tan tran, van toan, dan toan
tap toan » tap doan, tap quan, bai toan

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 - thanh tinh ((cao thuong) or (cho thuong)) cong ((tan toan) OR (tap toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - thanh tinh ((cao thuong) OR (cho thuong)) cong ((tan toan) OR (tap toan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - thanh tinh ((cao thuong) or (cho thuong)) cong ((tan toan) OR (tap toan)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh tinh ((cao thuong) or (cho thuong)) cong ((tan toan) OR (tap toan)) ban*.