Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » canh tranh, hanh chinh
luong cong » dung cong, trong cong, cong cong
trinh dai » trinh tai, trinh di, trinh da
dai luong » dai cuong, dai duong, do luong
san thanh » ban thanh, van thanh, dan thanh
son thanh » ban thanh, van thanh
ho chieu » theo chieu, hoc thieu, doi chieu

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 dai luong cong ((san thanh) OR (son thanh)) hai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - hanh trinh dai luong cong ((san thanh) OR (son thanh)) hai".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh trinh dai luong cong ((san thanh) OR (son thanh)) hai*.