Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
truong va » truong dai, truong cao, truong dao
thang va » hang va, trang va, thong va
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap

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) or (chinh sach)) - thanh ((thang va) or (truong va)) thong cong van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (chinh sach)) - thanh ((thang va) OR (truong va)) thong cong van toan cao.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (chinh sach)) - thanh ((thang va) or (truong va)) thong cong van toan cao*.