Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
dung cong » dung trong
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
trung va » truong va, trang va, trung tam
trung ha » trung hoc, trung tam, trung cap
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 - thanh ((trung va) OR (trung ha)) dung cong manh toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - thanh ((trung va) OR (trung ha)) dung cong manh toan cao".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - thanh ((trung va) OR (trung ha)) dung cong manh toan cao*.