Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thong cong » trong cong, tong cong, thong thong
hoc chieu » hoc thieu, ho chieu, hoc hien
trinh cua » trinh luat, trinh quan, trinh luan
manh toan » thanh toan, anh tuan, tinh toan
tinh cua » sinh cua, tinh chat, tranh cua
dan toan » van toan, dan than, xuan toan

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 - hanh ((trinh cua) OR (tinh cua)) thong cong ((dan toan) or (manh toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - hanh ((trinh cua) OR (tinh cua)) thong cong ((dan toan) OR (manh toan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sach - hanh ((trinh cua) OR (tinh cua)) thong cong ((dan toan) or (manh toan)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - hanh ((trinh cua) OR (tinh cua)) thong cong ((dan toan) or (manh toan)) ban*.