Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
toan thuc » toan hoc, dan thuc, nhan thuc
thuc hung » thuc chung, thuc nhung, thuc dung
hung cong » nhung cong, hung cuong, phung cong
phan cac » nhan cach, phan dau, phan lap
cong co » dong co, cong cu, cong so

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

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