Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
truong cao » truong dai
hieu lang » chieu sang, nhieu tang, hieu van
trung cap » trung tam
dang cong » dung cong
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van 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: ho ((hieu lang) OR (hieu quang)) - thanh ((trung cap) or (truong cao)) dang cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (hieu quang)) - thanh ((trung cap) OR (truong cao)) dang cong tan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) OR (hieu quang)) - thanh ((trung cap) or (truong cao)) dang cong tan toan cau".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) OR (hieu quang)) - thanh ((trung cap) or (truong cao)) dang cong tan toan cau*.