Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhiet nang » nhiet dong, viet nang, nhieu tang
thong cong » trong cong, tong cong, thong thong
trang cua » tranh cua, trung cua, thang cua
tang cua » mang cua, hang cua, tang luan
cong dan » cong san, cong tan, huong dan
dan van » dang van, doan van, dao 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 (nhiet nang)) - hanh ((trang cua) OR (tang cua)) thong cong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (nhiet nang)) - hanh ((trang cua) OR (tang cua)) thong cong dan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (nhiet nang)) - hanh ((trang cua) OR (tang cua)) thong cong dan van ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (nhiet nang)) - hanh ((trang cua) OR (tang cua)) thong cong dan van ban*.