Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
thanh trung » thanh tung
thieu xanh » chieu xanh, hieu manh, thien anh
hanh trang » canh tranh, hanh trinh, minh trang
hoc thieu » toc thieu, hoc hien
cong san » cong tac
tra cau » tra sau, ta cau, tra cuu
ban cau » bang cau, ban can, van 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 - ((hanh trang) or (thanh trung)) va thuong cong san ((tra cau) or (ban cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - ((hanh trang) OR (thanh trung)) va thuong cong san ((tra cau) OR (ban cau)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - ((hanh trang) or (thanh trung)) va thuong cong san ((tra cau) or (ban cau))*.