Perhaps you should try some spelling variations:
thieu xanh » hieu manh, thien anh, thien danh
chieu xanh » chieu sach, chieu sang, chieu tinh
thanh hop » thanh hoa, thanh ho, thanh hoc
thong van » trong van, thong va, thong quan
van thanh » ban thanh, van tuan
thanh cau » thanh chau, thanh mau, nhanh cau
hop toan » hop hoan, phap toan, tap 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) OR (chieu xanh)) - thanh hop toan thong thong van thanh cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) OR (chieu xanh)) - thanh hop toan thong thong van thanh cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) OR (chieu xanh)) - thanh hop toan thong thong van thanh cau*.