Perhaps you should try some spelling variations:
khoang cong » hoang cong, khoang trong, thong cong
chieu xanh » chieu sach, chieu sang, chieu tinh
tam khoang » tao khoang, tai khoan, cam hoang
hieu manh » hieu nganh, dieu hanh, hien hanh
huong tam » duong tam, huong tac, huong tran
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
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: hoc ((hieu manh) or (chieu xanh)) - anh huong tam khoang cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (chieu xanh)) - anh huong tam khoang cong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (chieu xanh)) - anh huong tam khoang cong dan toan cao*.