Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
cua thong » cua thuong, cua khong, suat thong
chi xanh » chi anh, chi danh, chi hanh
cua tong » cua cong, cua dong, cua nong
tap toan » tap doan, tap quan
bai toan » bai tap
doi chi » doi khi

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

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