Perhaps you should try some spelling variations:
trung thanh » truong thanh
chieu sang » chieu sach, chieu xanh, hieu lang
nhung cong » dung cong, thong cong, hang cong
hoc chieu » hoc thieu, ho chieu, hoc hien
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 sang - manh ((trung thanh) or (trung tam)) nhung cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sang - manh ((trung thanh) OR (trung tam)) nhung cong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc chieu sang - manh ((trung thanh) or (trung tam)) nhung cong dan toan cau*.