Perhaps you should try some spelling variations:
quang trong » quang truong, quang trung, quang thong
thieu xanh » chieu xanh, hieu manh, thien anh
tranh tran » thanh tran, tranh toan, tranh tren
quan trong » gian trong
hoc thieu » toc thieu, hoc hien
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 xanh - canh tranh tran ((quang trong) or (quan trong)) ((dan than) OR (ban than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - canh tranh tran ((quang trong) OR (quan trong)) ((dan than) OR (ban than)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - canh tranh tran ((quang trong) or (quan trong)) ((dan than) OR (ban than)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - canh tranh tran ((quang trong) or (quan trong)) ((dan than) OR (ban than)) cao*.