Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
cua truong » cua trung, xuan truong, cac truong
tranh cua » doanh cua, manh cua
duong tan » duong tuan, duong van, duong tai
dong tan » dong tai, dong san, cong tan
toan cao » toan ban, toan tap

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)) - canh tranh cua truong ((dong tan) or (duong tan)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chieu sang)) - canh tranh cua truong ((dong tan) OR (duong tan)) toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) OR (chieu sang)) - canh tranh cua truong ((dong tan) or (duong tan)) toan cao*".