Perhaps you should try some spelling variations:
hieu sach » chieu sach, hieu cach, dien sach
doc hieu » toc thieu, hoc thieu, hoc hien
dap dung » dan dung, dap ung, cap dung
cong san » cong tac
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap
ap dung » xay dung, van dung

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 cong ((dap dung) or (ap 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 cong ((dap dung) OR (ap 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 cong ((dap dung) or (ap dung)) cong san ((toan cau) OR (toan cao))".
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - thanh cong ((dap dung) or (ap dung)) cong san ((toan cau) OR (toan cao))*.