Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thong cong » tong cong, thong thong, phong chong
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
tinh cua » trinh cua, sinh cua, tinh chat
van than » van thanh, van thang, van tuan
than cao » toan cao, thai cao, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi ((hieu lang) or (thieu quang)) - hanh tinh cua ((thong cong) OR (trong cong)) van than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi ((hieu lang) OR (thieu quang)) - hanh tinh cua ((thong cong) OR (trong cong)) van than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi ((hieu lang) or (thieu quang)) - hanh tinh cua ((thong cong) OR (trong cong)) van than cao".
• Adding a wildcard symbol may retrieve word variants: hoi ((hieu lang) or (thieu quang)) - hanh tinh cua ((thong cong) OR (trong cong)) van than cao*.