Perhaps you should try some spelling variations:
thanh tieng » hanh tieng, thanh tien, thanh tung
hieu nganh » vien nganh, hiem ngan, hieu manh
tieng nhat » tieng han
nhat thong » nhat thuong, nhat trong, nha thong
hieu xanh » chieu xanh, hieu manh, dieu hanh
song van » hoang van, trong van, duong van
cong san » cong tac

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 xanh) OR (hieu nganh)) - thanh tieng nhat thong ((song van) or (cong san)) phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (hieu nganh)) - thanh tieng nhat thong ((song van) OR (cong san)) phan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) OR (hieu nganh)) - thanh tieng nhat thong ((song van) or (cong san)) phan tu".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) OR (hieu nganh)) - thanh tieng nhat thong ((song van) or (cong san)) phan tu*.