Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hieu sang » chieu sang, hieu quang, nhieu tang
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tram » hanh tam, hanh trang, thanh tran
van thong » van thuong, van phong, va thong
tac tranh » tac thanh, tap tranh, sach tranh
tranh ban » trinh ban, tranh hang, tranh luan
tram van » tran van, tam van, trang van
cong tac » cong ty

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu sang) OR (hieu lang)) - hanh tram van thong cong tac tranh ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sang) OR (hieu lang)) - hanh tram van thong cong tac tranh ban".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sang) OR (hieu lang)) - hanh tram van thong cong tac tranh ban*.