Perhaps you should try some spelling variations:
tuong huong » truong huong, tuong duong, thong huong
chieu xanh » chieu sach, chieu sang, chieu tinh
truong cao » truong dai
hien xanh » hien hanh, hien nhanh, hien khanh
truong va » truong dai, truong dao, luong va
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien xanh) OR (chieu xanh)) - thanh ((truong va) or (truong cao)) tuong huong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (chieu xanh)) - thanh ((truong va) OR (truong cao)) tuong huong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) OR (chieu xanh)) - thanh ((truong va) or (truong cao)) tuong huong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) OR (chieu xanh)) - thanh ((truong va) or (truong cao)) tuong huong dan toan cau*.