Perhaps you should try some spelling variations:
chiet tach » chieu sach
cong thanh » dong thanh, cong trinh, cong tan
trang van » tran van, trang va, tang van
trong van » trong cac
dung cong » dung trong
ho chiet » ho chieu, ho thiet, hoc thiet
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chiet tach - hanh ((trang van) OR (trong van)) dung cong thanh ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - hanh ((trang van) OR (trong van)) dung cong thanh ((toan cau) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chiet tach - hanh ((trang van) OR (trong van)) dung cong thanh ((toan cau) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - hanh ((trang van) OR (trong van)) dung cong thanh ((toan cau) or (toan tap))*.