Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
thanh tinh » thanh binh, nhanh tinh, than kinh
nhung cong » thong cong, hang cong, nhung don
hien hanh » dieu hanh
dung cong » dung trong
dan toan » van toan, dan than, manh toan
toan tap » toan ban
tinh va » tich va, trinh van, trinh vat

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 hanh) or (chieu xanh)) - thanh tinh va ((nhung cong) OR (dung cong)) dan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien hanh) OR (chieu xanh)) - thanh tinh va ((nhung cong) OR (dung cong)) dan toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien hanh) or (chieu xanh)) - thanh tinh va ((nhung cong) OR (dung cong)) dan toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien hanh) or (chieu xanh)) - thanh tinh va ((nhung cong) OR (dung cong)) dan toan tap*.