Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
tran xuan » tran quang, tran van
hoi hieu » hoi phieu, hoi tieu, moi hieu
tuong va » truong va, thuong va, luong va
trung va » truong va, trang va, trung ha
cong tan » cong tac, cong san, cong thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi hieu lang - thanh ((tuong va) or (trung va)) thong cong tan tran xuan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi hieu lang - thanh ((tuong va) OR (trung va)) thong cong tan tran xuan.
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - thanh ((tuong va) or (trung va)) thong cong tan tran xuan*.