Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chu xanh » chu manh, chieu xanh, chua xang
dung thi » dung tai, dung chi, dung thu
dung tri » dung tai, dung tren, dung sai
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap
chu van » cuu van, chu han

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: theo ((chu xanh) OR (chu van)) - sach ((dung thi) OR (dung tri)) nhung cong van toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chu xanh) or (chu van)) - sach ((dung thi) OR (dung tri)) nhung cong van toan cao~".
• Adding a wildcard symbol may retrieve word variants: theo ((chu xanh) or (chu van)) - sach ((dung thi) OR (dung tri)) nhung cong van toan cao*.