Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
truong ton » truong son, truong tinh, truong bo
trong toan » truong toan, trong tan, trong hoan
trinh thi » trinh tai, trinh tu, trinh tin
ho chieu » theo chieu, hoc thieu, doi chieu
dinh thi » dinh tri

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu sach - hanh ((trinh thi) OR (dinh thi)) nhung cong ((truong ton) or (trong toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - hanh ((trinh thi) OR (dinh thi)) nhung cong ((truong ton) OR (trong toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - hanh ((trinh thi) OR (dinh thi)) nhung cong ((truong ton) or (trong toan)) cau".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh ((trinh thi) OR (dinh thi)) nhung cong ((truong ton) or (trong toan)) cau*.