Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhieu tang » chieu sang, nhiet nang
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, hieu van
tranh cua » doanh cua, manh cua
cua thong » cua thuong, cua khong, cua tong
cong dan » cong san, cong tan, huong dan
dan can » dan chan, dan canh, dan ca
can ban » van ban, toan ban

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 (((hieu lang) OR (nhieu tang)))) - canh tranh cua thong cong dan can ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (((hieu lang) OR (nhieu tang)))) - canh tranh cua thong cong dan can ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (((hieu lang) OR (nhieu tang)))) - canh tranh cua thong cong dan can ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (((hieu lang) OR (nhieu tang)))) - canh tranh cua thong cong dan can ban*.