Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thanh trung » thanh tung
nhung cong » dung cong, thong cong, nhung don
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung tuan, trung cap
hang cong » dang cong, hang nong, bang cong
dan than » dan chan, van than, dan toan
ban than » ban thanh, van thanh, ban hang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu quang - thanh trung cua ((nhung cong) or (hang cong)) ((dan than) or (ban than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu quang - thanh trung cua ((nhung cong) OR (hang cong)) ((dan than) OR (ban than)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu quang - thanh trung cua ((nhung cong) or (hang cong)) ((dan than) or (ban than)) cao*.