Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
nhung cong » dung cong, thong cong, hang cong
lang nhanh » lang thanh, vung nhanh, dang hanh
hieu lang » chieu sang, nhieu tang, hieu van
cong lang » cong vang, cong luong, cong quang
nhanh cau » nhanh cay, thanh chau, nhanh ha
trung ha » trung hoc, trung cap

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 tam) or (trung ha)) nhung cong lang nhanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (hieu quang)) - thanh ((trung tam) OR (trung ha)) nhung cong lang nhanh cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) OR (hieu quang)) - thanh ((trung tam) or (trung ha)) nhung cong lang nhanh cau".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) OR (hieu quang)) - thanh ((trung tam) or (trung ha)) nhung cong lang nhanh cau*.