Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
cang thang » dang thanh
cong thanh » dong thanh, cong trinh, cong tan
cong quang » luong quang, thong quang, duong quang
quang tran » quang tuan, quang trung, quang thanh
dang cong » dung cong
tran ban » tranh ban, tran van, toan ban
va dang » van dang, va nang, va lang

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)) - ((cang thang) or (cong thanh)) va dang cong quang tran ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chieu sang)) - ((cang thang) OR (cong thanh)) va dang cong quang tran ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) OR (chieu sang)) - ((cang thang) or (cong thanh)) va dang cong quang tran ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) OR (chieu sang)) - ((cang thang) or (cong thanh)) va dang cong quang tran ban*.