Perhaps you should try some spelling variations:
thanh tung » thanh cong
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
cap thong » cap tong, chap thuong, phap thong
hoi hieu » hoi phieu, hoi tieu, moi hieu
cong tac » cong ty
toan cau » toan cao, toan ban, toan tap
phan cau » phan dau, phan cac, phan tu

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 trung) or (thanh tung)) cap thong cong tac ((toan cau) or (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi hieu lang - ((thanh trung) OR (thanh tung)) cap thong cong tac ((toan cau) OR (phan cau)).
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - ((thanh trung) or (thanh tung)) cap thong cong tac ((toan cau) or (phan cau))*.