Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
rong thanh » dong thanh, cong thanh, truong thanh
hieu manh » hieu nganh, dieu hanh, hien hanh
trung qua » trung quan, trong qua, truong quan
trung cua » truong cua, trung tuan, trung cap
dung rong » dung trong, dung cong, dung dong
san cao » san co, san cho, san bao

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) OR (chieu xanh)) - thanh ((trung qua) or (trung cua)) dung rong thanh san cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (chieu xanh)) - thanh ((trung qua) OR (trung cua)) dung rong thanh san cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) OR (chieu xanh)) - thanh ((trung qua) or (trung cua)) dung rong thanh san cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) OR (chieu xanh)) - thanh ((trung qua) or (trung cua)) dung rong thanh san cao*.