Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
doi chieu » doc hieu, doi chi, ho chieu
hanh tang » hanh trang, anh tang, hanh mang
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
tran cao » tran chau, trang cho, tranh cac
toan cao » toan ban, toan tap
tang va » trang va, tang van, thang va
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (doi chieu)) sach - hanh tang va dung cong tan ((tran cao) OR (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (doi chieu)) sach - hanh tang va dung cong tan ((tran cao) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (doi chieu)) sach - hanh tang va dung cong tan ((tran cao) OR (toan cao))".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (doi chieu)) sach - hanh tang va dung cong tan ((tran cao) OR (toan cao))*.