Perhaps you should try some spelling variations:
thong dong » thong duong, thuong dong, thong cong
hieu lang » chieu sang, hieu quang, nhieu tang
dong tang » dong bang, cong tang, dong nang
thanh tap » thanh tai, thanh tay, thanh tam
thanh lap » thanh san, phan lap, thanh hai
tranh va » tranh van, trang va, trinh va
va thong » va thuong, va phuong, he thong
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - canh tranh va thong dong tang ((thanh tap) OR (thanh lap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - canh tranh va thong dong tang ((thanh tap) OR (thanh lap))".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - canh tranh va thong dong tang ((thanh tap) OR (thanh lap))*.