Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
chieu tinh » trieu tinh, lieu tinh, chau tinh
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung cong » dung cong, thong cong, nhung don
tranh cua » doanh cua, manh cua
hang cong » dang cong, hang nong, bang cong
dan than » dan chan, ban than, van than
than ban » thanh ban, toan ban, than man

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

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