Perhaps you should try some spelling variations:
thong chuan » thong chuon, trong chuan, thong chuyen
chieu xanh » chieu sach, chieu sang, chieu tinh
trong chan » trong chuan, trong cham, trong can
hieu xanh » hieu manh, hieu nganh, dieu hanh
hang nong » thang long, han tong
nong dan » cong dan, nong san, nguong dan
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: doc ((hieu xanh) OR (chieu xanh)) - hanh ((thong chuan) or (trong chan)) hang nong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (chieu xanh)) - hanh ((thong chuan) OR (trong chan)) hang nong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) OR (chieu xanh)) - hanh ((thong chuan) or (trong chan)) hang nong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) OR (chieu xanh)) - hanh ((thong chuan) or (trong chan)) hang nong dan toan cao*.