Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
hanh trang » thanh trung, canh tranh, hanh trinh
doi chieu » doc hieu, doi chi, ho chieu
hanh tang » anh tang, hanh mang, hanh tung
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
tran cao » toan cao, tran chau, trang cho
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) OR (hanh trang)) va dung cong tan tran cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (doi chieu)) sach - ((hanh tang) OR (hanh trang)) va dung cong tan tran cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (doi chieu)) sach - ((hanh tang) OR (hanh trang)) va dung cong tan tran cao".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (doi chieu)) sach - ((hanh tang) OR (hanh trang)) va dung cong tan tran cao*.