Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
hanh hang » thanh hang, hang hang, hanh han
va thong » va thuong, va phuong, he thong
cong san » cong tac
hang tai » dung tai

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 hang va thong cong san ((hang dau) or (hang tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - hanh hang va thong cong san ((hang dau) OR (hang tai)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh hang va thong cong san ((hang dau) or (hang tai))*.