Perhaps you should try some spelling variations:
hieu sach » chieu sach, hieu cach, dien sach
cong cong » cong dong, trong cong, dung cong
doc hieu » toc thieu, hoc thieu, hoc hien
anh quan » ban quan, anh nhan, anh quoc
cong tap » cuong tap, cong tac, cong tan
doan cao » doanh cao, toan cao, hoang cao
doan cap » doanh cao, dan ca, toan cao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu sach - ((anh quan) or (anh tuan)) thanh cong cong tap ((doan cao) OR (doan cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - ((anh quan) OR (anh tuan)) thanh cong cong tap ((doan cao) OR (doan cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu sach - ((anh quan) or (anh tuan)) thanh cong cong tap ((doan cao) OR (doan cap))".
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - ((anh quan) or (anh tuan)) thanh cong cong tap ((doan cao) OR (doan cap))*.