Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
tranh cua » doanh cua, manh cua
tong tap » tuong tac, trong tan, cong tac
cong tan » cong tac, cong san, cong thanh
toan cao » toan tap
toan ban » van ban

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

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