Perhaps you should try some spelling variations:
dong trong » duong trong, dung trong, cong trong
chieu sang » chieu sach, chieu xanh, hieu lang
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh cua » doanh cua, manh cua
cac thanh » bac thanh, cach nhanh, ban thanh
thanh bai » thanh hai, thanh tai, thanh oai
cua dong » chua dong, cua cong, cua dang

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 (hieu manh)) - canh tranh cua dong trong cac thanh bai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu manh)) - canh tranh cua dong trong cac thanh bai.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (hieu manh)) - canh tranh cua dong trong cac thanh bai*.