Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
cong thanh » dong thanh, cong trinh, truong thanh
tieu hanh » dieu hanh, tiem hanh, tien hanh
luan hang » luan nang, luan han, luan hung
anh tang » anh bang, anh dang, anh nang
cong tan » cong tac, cong san, cong ty
toan cau » 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: theo tieu hanh - ((anh tang) or (hanh trang)) luan hang ((cong thanh) OR (cong tan)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu hanh - ((anh tang) OR (hanh trang)) luan hang ((cong thanh) OR (cong tan)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu hanh - ((anh tang) or (hanh trang)) luan hang ((cong thanh) OR (cong tan)) toan cau".
• Adding a wildcard symbol may retrieve word variants: theo tieu hanh - ((anh tang) or (hanh trang)) luan hang ((cong thanh) OR (cong tan)) toan cau*.