Perhaps you should try some spelling variations:
truong thanh » truong trung, truong thpt, truong chung
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
doi hieu » doi chieu, doc hieu, doi hien
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - hanh ((trung tam) OR (truong thanh)) thong cong san toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi hieu lang - hanh ((trung tam) OR (truong thanh)) thong cong san toan ban".
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - hanh ((trung tam) OR (truong thanh)) thong cong san toan ban*.