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