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