Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu tinh, hieu manh
chieu sang » chieu sach, hieu lang, nhieu tang
manh trung » manh tung, thanh trung, manh hung
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
trung ha » trung hoc, trung tam, trung cap
dan toan » van toan, dan than, manh toan
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: hoc ((chieu xanh) or (chieu sang)) - manh trung ha ((nhung cong) OR (thong cong)) dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (chieu sang)) - manh trung ha ((nhung cong) OR (thong cong)) dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) or (chieu sang)) - manh trung ha ((nhung cong) OR (thong cong)) dan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (chieu sang)) - manh trung ha ((nhung cong) OR (thong cong)) dan toan cao*.