Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
hanh tung » thanh tung, manh tung, hanh dung
cua thong » cua thuong, cua khong, cua tong
anh tang » anh bang, anh dang, anh nang
tin van » tien van, tan van, tin va

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 sang) or (chieu sach)) - ((hanh tung) or (anh tang)) cua thong thong tin van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chieu sach)) - ((hanh tung) OR (anh tang)) cua thong thong tin van ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (chieu sach)) - ((hanh tung) or (anh tang)) cua thong thong tin van ban*.