Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, nhieu tang
thong cong » trong cong, tong cong, thong thong
trinh than » trinh thanh, trinh han, trinh toan
hieu lang » hieu quang, nhieu tang, hieu van
chi chang » thi chang, chi nhanh, thi hang
trung ha » trung hoc, trung tam, trung cap
ha thong » hoa thong, nha thong, he thong
than tap » toan tap, han tap, phan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((((chieu sang) or (hieu lang))) or (chi chang)) - thanh trung ha thong cong trinh than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((((chieu sang) OR (hieu lang))) OR (chi chang)) - thanh trung ha thong cong trinh than tap.
• Adding a wildcard symbol may retrieve word variants: doi ((((chieu sang) or (hieu lang))) or (chi chang)) - thanh trung ha thong cong trinh than tap*.