Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
chieu xanh » chieu sach, chieu sang, chieu tinh
hung cong » nhung cong, hung cuong, phung cong
cong than » cong thanh, cong thang, cong tan
than phan » thanh phan, toan phan, thanh pham
toan hoc » toan khoa, van hoc, hoa hoc
hoc hung » hoc huong, hoc nhung, hoc ung
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien thanh) or (chieu xanh)) - tinh toan hoc hung cong than phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien thanh) OR (chieu xanh)) - tinh toan hoc hung cong than phan dau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thien thanh) or (chieu xanh)) - tinh toan hoc hung cong than phan dau*.