Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh hang » thanh hang, hanh han, hanh mang
hang hang » nang hang, cang thang, hung thang
khi xanh » khia canh, thi hanh, thi anh
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi khi xanh - ((hanh hang) or (hang hang)) va nhung cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi khi xanh - ((hanh hang) OR (hang hang)) va nhung cong san toan cau.
• Adding a wildcard symbol may retrieve word variants: doi khi xanh - ((hanh hang) or (hang hang)) va nhung cong san toan cau*.