Perhaps you should try some spelling variations:
thuong thong » thong thong, thuong trong, thuong phuong
thanh trung » thanh tung
chieu xanh » chieu sach, chieu sang, chieu tinh
cua thuong » cua truong, cua phuong, ca thuong
hieu quan » hieu qua, lieu quan, thien quan
trung cua » truong cua, trung tuan, trung cap
ban toan » ban than, van toan, bao toan
bai toan » bai tap

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 xanh) or (hieu quan)) - thanh trung cua thuong thong ((ban toan) OR (bai toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu xanh) OR (hieu quan)) - thanh trung cua thuong thong ((ban toan) OR (bai toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu xanh) or (hieu quan)) - thanh trung cua thuong thong ((ban toan) OR (bai toan)) cau".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu xanh) or (hieu quan)) - thanh trung cua thuong thong ((ban toan) OR (bai toan)) cau*.