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
chua dong » cua dong, ha dong, hoa dong
duong van » duong va, luong va, dang van
van thanh » ban thanh, van tuan
thanh tap » thanh lap, thanh tai, thanh tay
huy dong » ha dong

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

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