Perhaps you should try some spelling variations:
nang thong » nang thuong, mang thong, nang trong
chieu sach » chinh sach, chiet tach, chieu sang
thong gian » khong gian, thong giao, chong gian
hieu lang » chieu sang, hieu quang, nhieu tang
cong dan » cong san, cong tan, huong dan
than cau » toan cau, than cap, thanh chau
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sach) or (hieu lang)) - nang thong gian trong cong dan ((than cau) or (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (hieu lang)) - nang thong gian trong cong dan ((than cau) OR (phan cau)).
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (hieu lang)) - nang thong gian trong cong dan ((than cau) or (phan cau))*.