Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thuong cao » truong cao, thuong chau, thuong mai
thong cao » thong cac, thong cap, thong cau
cong thuc » cong tac
thanh cac » hanh cac, thanh bac, thanh ca
ho chieu » theo chieu, hoc thieu, doi chieu
cong cu » chung cu

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: ho chieu sach - thanh ((thuong cao) OR (thong cao)) hang ((cong cu) OR (cong thuc)) thanh cac~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - thanh ((thuong cao) OR (thong cao)) hang ((cong cu) or (cong thuc)) thanh cac~".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - thanh ((thuong cao) OR (thong cao)) hang ((cong cu) or (cong thuc)) thanh cac*.