Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
canh trinh » canh tranh, hanh trinh, canh tinh
hoc thieu » toc thieu, hoc hien
van thang » van thanh, van khang, van than
van hang » van khang, van hoang, ban hang
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
chan cau » phan cau, can cau, chinh cau

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 trinh ((van hang) OR (van thang)) ((cong dan) or (cong san)) chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - canh trinh ((van hang) OR (van thang)) ((cong dan) OR (cong san)) chan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - canh trinh ((van hang) OR (van thang)) ((cong dan) or (cong san)) chan cau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - canh trinh ((van hang) OR (van thang)) ((cong dan) or (cong san)) chan cau*.