Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
hang hang » nang hang, cang thang, hung thang
nang cong » nang song, dang cong, bang cong
khi xanh » khia canh, thi hanh, thi anh
hang van » hoang van, hang va, dang van
van nang » van quang, van ban, van dong
dan toan » van toan, dan than, manh toan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doi khi xanh - hang hang van nang cong ((dan toan) OR (thanh toan)) cau~.
• Adding a wildcard symbol may retrieve word variants: doi khi xanh - hang hang van nang cong ((dan toan) or (thanh toan)) cau*.