Perhaps you should try some spelling variations:
hieu sach » chieu sach, hieu cach, dien sach
trung dai » truong dai, truong dao, trung tam
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
tung dai » tuong dai, tung dan, hung dai
cong san » cong tac
toan cau » toan ban, toan tap, toan tai
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: doc hieu sach - thanh ((tung dai) OR (trung dai)) dung cong san ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - thanh ((tung dai) OR (trung dai)) dung cong san ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu sach - thanh ((tung dai) OR (trung dai)) dung cong san ((toan cau) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - thanh ((tung dai) OR (trung dai)) dung cong san ((toan cau) or (toan cao))*.