Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
thanh tung » thanh cong
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
hieu manh » chieu xanh, hieu nganh, dieu hanh
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap
tung va » trung va, tuong va, dung va

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 manh) or (chieu sang)) - thanh tung va ((nhung cong) OR (thong cong)) tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu manh) OR (chieu sang)) - thanh tung va ((nhung cong) OR (thong cong)) tan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu manh) or (chieu sang)) - thanh tung va ((nhung cong) OR (thong cong)) tan toan cao".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu manh) or (chieu sang)) - thanh tung va ((nhung cong) OR (thong cong)) tan toan cao*.