Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hieu nganh » vien nganh, hiem ngan, hieu manh
thong cong » trong cong, tong cong, thong thong
cong san » cong tac
san than » sang than, san thanh, ban than
than tap » toan tap, han tap, phan tap
san he » dan he, san ha, van he
san ho » san cho, san co, sin ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (hieu nganh)) - hanh ((san he) OR (san ho)) thong cong san than tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (hieu nganh)) - hanh ((san he) OR (san ho)) thong cong san than tap~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (hieu nganh)) - hanh ((san he) OR (san ho)) thong cong san than tap*.