Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
tranh cua » doanh cua, manh cua
cua dong » chua dong, cua cong, cua dang
cong huy » cuong huy, dong huy, cong duy
cong quy » cung quy, cong ty, cong cu

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

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