Perhaps you should try some spelling variations:
hien xanh » hien nhanh, chieu xanh, hien khanh
hien hanh » dieu hanh
toan thuc » toan hoc, dan thuc, nhan thuc
thuc dung » thuoc dung, thuy dung, tuc dung
dung cong » dung trong
cong than » cong thanh, cong thang, cong tan
phan cac » phan dau, phan lap, phan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien xanh) or (hien hanh)) - tinh toan thuc dung cong than ((phan cac) OR (nhan cach))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien hanh)) - tinh toan thuc dung cong than ((phan cac) OR (nhan cach)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (hien hanh)) - tinh toan thuc dung cong than ((phan cac) OR (nhan cach))".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hien hanh)) - tinh toan thuc dung cong than ((phan cac) OR (nhan cach))*.