Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thong cong » trong cong, tong cong, thong thong
doi chieu » doc hieu, doi chi, ho chieu
hanh hang » thanh hang, hanh han, hanh mang
hang hang » nang hang, cang thang, hung thang
cua thong » cua thuong, cua khong, cua tong
cong tan » cong tac, cong san, cong thanh
than cao » thai cao, than cap, than sao
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 - ((hanh hang) OR (hang hang)) cua thong cong tan ((than cao) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - ((hanh hang) OR (hang hang)) cua thong cong tan ((than cao) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - ((hanh hang) OR (hang hang)) cua thong cong tan ((than cao) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - ((hanh hang) OR (hang hang)) cua thong cong tan ((than cao) or (toan cao))*.