Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
doanh luan » doanh nhan
nhung cong » dung cong, thong cong, hang cong
cong tac » cong ty
tac can » tac van, tac quan, tac vang
can tu » ban tu, van tu, han tu

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 (chieu sach)) - canh ((doanh cua) OR (doanh luan)) nhung cong tac can tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (chieu sach)) - canh ((doanh cua) OR (doanh luan)) nhung cong tac can tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sang) or (chieu sach)) - canh ((doanh cua) OR (doanh luan)) nhung cong tac can tu".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) or (chieu sach)) - canh ((doanh cua) OR (doanh luan)) nhung cong tac can tu*.