Perhaps you should try some spelling variations:
truong thanh » truong trung, truong thpt, truong chung
chieu xanh » chieu sach, chieu sang, chieu tinh
chau tinh » cuu tinh, ha tinh, cua tinh
hung cong » nhung cong, hung cuong, phung cong
cong dan » cong san, cong tan, huong dan
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 ((chieu xanh) or (chau tinh)) - hanh ((trung thanh) OR (truong thanh)) hung cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (chau tinh)) - hanh ((trung thanh) OR (truong thanh)) hung cong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) or (chau tinh)) - hanh ((trung thanh) OR (truong thanh)) hung cong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (chau tinh)) - hanh ((trung thanh) OR (truong thanh)) hung cong dan toan cau*.