Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
tranh thai » trang thai, tran thi, tinh thai
hach toan » thanh toan, manh toan
ho chieu » theo chieu, hoc thieu, doi chieu
thai van » thi van, thanh van, thai vung
van cong » van dong, van phong, phan cong
tap toan » tap doan, tap quan, bai 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: ho chieu xanh - canh tranh thai van cong ((tap toan) OR (hach toan)) cau~.
• Adding a wildcard symbol may retrieve word variants: ho chieu xanh - canh tranh thai van cong ((tap toan) or (hach toan)) cau*.