Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
truong cua » truong ca, truong quan, truong cao
nhung cong » dung cong, thong cong, hang cong
trung cua » trung tuan, trung cap, dung cua
cong doan » cong dan, cong hoan, dong doanh
doan van » doan va, hoang van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) OR (chieu sang)) - hanh ((trung cua) or (truong cua)) nhung cong doan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chieu sang)) - hanh ((trung cua) OR (truong cua)) nhung cong doan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) OR (chieu sang)) - hanh ((trung cua) or (truong cua)) nhung cong doan van ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) OR (chieu sang)) - hanh ((trung cua) or (truong cua)) nhung cong doan van ban*.