Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu tinh, hieu manh
chieu sang » chieu sach, hieu lang, nhieu tang
trong dang » truong dang, trong dan, trong dong
thong cua » thong quan, thong tu, huong cua
tang luan » dung luan
dang toan » dang tran, dan toan, dung toan
toan ban » van ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu xanh) OR (chieu sang)) - hanh ((thong cua) OR (tang luan)) dung trong dang toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu xanh) OR (chieu sang)) - hanh ((thong cua) or (tang luan)) dung trong dang toan ban~".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu xanh) OR (chieu sang)) - hanh ((thong cua) or (tang luan)) dung trong dang toan ban*.