Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hanh trinh » canh tranh, hanh chinh
hanh tinh » nhanh tinh, thanh tinh, canh tinh
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
cua dung » cua dang, cua dong, qua dung
cong tac » cong ty
tac phan » tac pham, tai phan, tac phat
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu sang - ((hanh tinh) OR (hanh trinh)) cua dung cong tac phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sang - ((hanh tinh) OR (hanh trinh)) cua dung cong tac phan dau".
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - ((hanh tinh) OR (hanh trinh)) cua dung cong tac phan dau*.