Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
nhieu tang » chieu sang, nhiet nang
hieu lang » chieu sang, hieu quang, hieu van
trung tai » truong tai, trung tam, trong tai
trung dai » truong dai, truong dao, trung tam
cong vang » cong lang, cong quang, cong ngang
vang toan » van toan, dang toan, quang toan
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 ((nhieu tang) or (hieu lang)) - hanh ((trung tai) OR (trung dai)) thuong cong vang toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((nhieu tang) OR (hieu lang)) - hanh ((trung tai) OR (trung dai)) thuong cong vang toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((nhieu tang) or (hieu lang)) - hanh ((trung tai) OR (trung dai)) thuong cong vang toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((nhieu tang) or (hieu lang)) - hanh ((trung tai) OR (trung dai)) thuong cong vang toan cau*.