Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, dung cua
trung cap » truong cao, trung tam
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
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 ((hieu lang) or (chieu sach)) - manh ((trung cua) OR (trung cap)) nhung cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu lang) OR (chieu sach)) - manh ((trung cua) OR (trung cap)) nhung cong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((hieu lang) or (chieu sach)) - manh ((trung cua) OR (trung cap)) nhung cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: doi ((hieu lang) or (chieu sach)) - manh ((trung cua) OR (trung cap)) nhung cong dan toan cao*.