Perhaps you should try some spelling variations:
thong chuan » thong chuon, trong chuan, thong chuyen
chieu xanh » chieu sach, chieu sang, chieu tinh
trong chan » trong chuan, trong cham, trong can
doi chieu » doc hieu, doi chi, ho chieu
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
toan cao » toan ban, toan 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 xanh - hanh ((thong chuan) or (trong chan)) hang ((cong tan) OR (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu xanh - hanh ((thong chuan) OR (trong chan)) hang ((cong tan) OR (cong san)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu xanh - hanh ((thong chuan) or (trong chan)) hang ((cong tan) OR (cong san)) toan cao".
• Adding a wildcard symbol may retrieve word variants: doi chieu xanh - hanh ((thong chuan) or (trong chan)) hang ((cong tan) OR (cong san)) toan cao*.