Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, hieu manh
chieu tinh » trieu tinh, lieu tinh, chau tinh
nhung cong » dung cong, thong cong, hang cong
hanh hinh » hanh chinh, hanh dinh, hanh trinh
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
cua nhung » va nhung
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
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 ((chieu xanh) OR (chieu tinh)) - ((hanh hinh) or (hanh tinh)) cua nhung cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu xanh) OR (chieu tinh)) - ((hanh hinh) OR (hanh tinh)) cua nhung cong tac toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu xanh) OR (chieu tinh)) - ((hanh hinh) or (hanh tinh)) cua nhung cong tac toan cao".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu xanh) OR (chieu tinh)) - ((hanh hinh) or (hanh tinh)) cua nhung cong tac toan cao*.