Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
chieu sang » chieu sach, chieu xanh, hieu lang
trung cua » truong cua, trung tuan, dung cua
trung cap » truong cao, trung tam
dang cong » dung 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 tinh) or (chieu sang)) - hanh ((trung cua) OR (trung cap)) dang cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu tinh) OR (chieu sang)) - hanh ((trung cua) OR (trung cap)) dang cong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu tinh) or (chieu sang)) - hanh ((trung cua) OR (trung cap)) dang cong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu tinh) or (chieu sang)) - hanh ((trung cua) OR (trung cap)) dang cong dan toan cau*.