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 » dap ung, cap dung, da dung
dan dung » van dung, tin dung
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cau » 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 (dan dung))) or (ap dung)) cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - thanh cong ((((dap dung) OR (dan dung))) OR (ap dung)) cong san toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu sach - thanh cong ((((dap dung) OR (dan dung))) or (ap dung)) cong san toan cau".
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - thanh cong ((((dap dung) OR (dan dung))) or (ap dung)) cong san toan cau*.