Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
dan thai » dang thai, dan thi, dan than
thai cao » tai cao, thoai cac, thuat cao
tang va » trang va, tang van, thang va

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sang) OR (chieu sach)) - anh ((tang va) OR (hang va)) dung cong dan thai cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sang) OR (chieu sach)) - anh ((tang va) or (hang va)) dung cong dan thai cao~".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sang) OR (chieu sach)) - anh ((tang va) or (hang va)) dung cong dan thai cao*.