Perhaps you should try some spelling variations:
chiet tach » chieu sach
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
trung dap » trung cap, trung dam, trung lap
trung dai » truong dai, truong dao, trung tam
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chiet tach) or (hieu lang)) - thanh ((trung dap) OR (trung dai)) nhung cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chiet tach) OR (hieu lang)) - thanh ((trung dap) OR (trung dai)) nhung cong dan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chiet tach) or (hieu lang)) - thanh ((trung dap) OR (trung dai)) nhung cong dan than cau".
• Adding a wildcard symbol may retrieve word variants: ho ((chiet tach) or (hieu lang)) - thanh ((trung dap) OR (trung dai)) nhung cong dan than cau*.