Perhaps you should try some spelling variations:
khong cong » thong cong, khong cang, chong cong
chieu sach » chinh sach, chiet tach, chieu sang
dien sach » dien anh
tranh cua » manh cua
doanh cua » doanh luan
lan chinh » luan chinh, van chinh, hanh chinh
chinh can » chinh ca, chinh ban, chinh cau
cong lan » cong luan, cong lang, cong san

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((chieu sach) or (dien sach)) - canh ((tranh cua) OR (doanh cua)) khong cong lan chinh can~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sach) OR (dien sach)) - canh ((tranh cua) OR (doanh cua)) khong cong lan chinh can.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((chieu sach) or (dien sach)) - canh ((tranh cua) OR (doanh cua)) khong cong lan chinh can".
• Adding a wildcard symbol may retrieve word variants: doc ((chieu sach) or (dien sach)) - canh ((tranh cua) OR (doanh cua)) khong cong lan chinh can*.