Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
thong qua » thong cua, thong tu, duong qua
dung cong » dung trong
cong toan » cong tan, cong hoan, cong tuan
toan quan » tran quang, doan quang, van quan
quan tap » quan tai, quan lap, quan tam

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sach) OR (chieu sang)) - thanh ((thong qua) or (thong quan)) dung cong toan quan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chieu sang)) - thanh ((thong qua) OR (thong quan)) dung cong toan quan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) OR (chieu sang)) - thanh ((thong qua) or (thong quan)) dung cong toan quan tap".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) OR (chieu sang)) - thanh ((thong qua) or (thong quan)) dung cong toan quan tap*.