Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
chiet tach » chieu sach
thanh tich » thanh tinh, than tich, thanh trinh
nhung cong » dung cong, thong cong, hang cong
hanh tich » hanh thich, hanh tinh, hanh trinh
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan
phan cau » phan dau, phan cac, phan tu

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) or (chiet tach)) - ((hanh tich) OR (thanh tich)) va nhung cong tan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (chiet tach)) - ((hanh tich) OR (thanh tich)) va nhung cong tan phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (chiet tach)) - ((hanh tich) OR (thanh tich)) va nhung cong tan phan cau".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (chiet tach)) - ((hanh tich) OR (thanh tich)) va nhung cong tan phan cau*.