Perhaps you should try some spelling variations:
thong dong » thong duong, thuong dong, thong cong
hieu lang » chieu sang, hieu quang, nhieu tang
dong bang » dong san
thanh tai » thanh hai, thanh toan, thanh san
trang va » tran van, hang va
trinh va » trinh van, trinh vat, trinh ve
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 ((trang va) or (trinh va)) thong dong bang ((thanh tai) OR (doanh tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - canh ((trang va) OR (trinh va)) thong dong bang ((thanh tai) OR (doanh tai)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - canh ((trang va) or (trinh va)) thong dong bang ((thanh tai) OR (doanh tai))".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - canh ((trang va) or (trinh va)) thong dong bang ((thanh tai) OR (doanh tai))*.