Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
chieu tach » chiet tach, chieu sach, chiu trach
cong thanh » dong thanh, cong trinh, truong thanh
doi chieu » doc hieu, doi chi, ho chieu
hanh tang » anh tang, hanh mang, hanh tung
cong tan » cong tac, cong san, cong ty
toan cao » toan ban, toan tap

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

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