Perhaps you should try some spelling variations:
phung thanh » phuong thanh, phong thanh, nhung thanh
hieu quang » thieu quang, hieu quan, hieu qua
hung thanh » nhung thanh, hung thang, dung thanh
hieu lang » chieu sang, nhieu tang, hieu van
tranh cua » doanh cua, manh cua
toan cau » toan cao, toan ban, toan tap
cua ung » cua rung, cua ong, cua nhung

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) or (hieu quang)) - canh tranh cua ung ((hung thanh) OR (phung thanh)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (hieu quang)) - canh tranh cua ung ((hung thanh) OR (phung thanh)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu lang) or (hieu quang)) - canh tranh cua ung ((hung thanh) OR (phung thanh)) toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) or (hieu quang)) - canh tranh cua ung ((hung thanh) OR (phung thanh)) toan cau*.