Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
cong ban » cong bang, cong san, cong tan
ban toan » bai toan, ban than, van toan
toan cao » toan ban, toan tap
tung ha » trung ha, dung ha, tang ha
tung ho » tuong ho, trung hoc, trung hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu xanh - thanh ((tung ha) OR (tung ho)) thuong cong ban toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - thanh ((tung ha) OR (tung ho)) thuong cong ban toan cao".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - thanh ((tung ha) OR (tung ho)) thuong cong ban toan cao*.