Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
hanh than » hanh han, hanh phan, nhanh thanh
hanh nhan » thanh nhan, danh nhan, anh nhan
cua nhung » va nhung
cong tan » cong tac, cong san, cong thanh
tan gian » tran gian, dan gian, van gian
gian cac » gian dan, gian cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu lang) or (chieu sang)) - ((hanh than) OR (hanh nhan)) cua nhung cong tan gian cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (chieu sang)) - ((hanh than) OR (hanh nhan)) cua nhung cong tan gian cac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu lang) or (chieu sang)) - ((hanh than) OR (hanh nhan)) cua nhung cong tan gian cac".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) or (chieu sang)) - ((hanh than) OR (hanh nhan)) cua nhung cong tan gian cac*.