Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
canh trinh » canh tranh, canh tinh, anh trinh
hanh trinh » canh tranh, hanh chinh
viet trong » viet trung, viet thong, viet huong
doi chieu » doc hieu, doi chi, ho chieu
vat trong » cay trong, dot trong, nam trong
cong tan » cong tac, cong san, cong thanh
tan khan » tan khang, tan nhan, toan khoan
khan cap » khan ap, than cap, khoan cam

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 sach - ((canh trinh) OR (hanh trinh)) ((vat trong) OR (viet trong)) cong tan khan cap~.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - ((canh trinh) or (hanh trinh)) ((vat trong) or (viet trong)) cong tan khan cap*.