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
tranh cua » doanh cua, manh cua
cua nhung » va nhung
cong van » cong vang, song van, cong tan
cong san » cong tac
toan ban » van ban

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 van) or (cong san)) toan 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 van) OR (cong san)) toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (chieu tinh)) - hanh tranh cua nhung ((cong van) or (cong san)) toan ban*.