Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thong cong » trong cong, tong cong, thong thong
hanh tich » hanh thich, thanh tich, hanh trinh
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
ho chieu » theo chieu, hoc thieu, doi chieu
va thong » va thuong, va phuong, he thong
cong can » cong san, cong tan, cong dan
can van » cac van, can ban, tan van
van cau » van dau, van hau, van chat

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 tich) or (hanh tinh)) va thong cong can van cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - ((hanh tich) OR (hanh tinh)) va thong cong can van cau.
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - ((hanh tich) or (hanh tinh)) va thong cong can van cau*.