Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu xanh » chieu sach, chieu sang, chieu tinh
thong cong » trong cong, thong thong, phong chong
hieu manh » hieu nganh, dieu hanh, hien hanh
tong cong » trong cong, cong cong, dung cong
trung va » truong va, trang va, trung ha
san toan » van toan, dan toan, 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 ((hieu manh) OR (chieu xanh)) - thanh trung va ((thong cong) or (tong cong)) san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (chieu xanh)) - thanh trung va ((thong cong) OR (tong cong)) san toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) OR (chieu xanh)) - thanh trung va ((thong cong) or (tong cong)) san toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) OR (chieu xanh)) - thanh trung va ((thong cong) or (tong cong)) san toan cau*.