Perhaps you should try some spelling variations:
truong thanh » truong trung, truong chung
hien xanh » hien nhanh, chieu xanh, hien khanh
hien hanh » dieu hanh
dang cong » dung cong
cong sang » cong san, cong lang, cong vang
sang toan » sang than, dang toan, quang toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien xanh) or (hien hanh)) - hanh ((truong thanh) OR (truong thpt)) dang cong sang toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien hanh)) - hanh ((truong thanh) OR (truong thpt)) dang cong sang toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (hien hanh)) - hanh ((truong thanh) OR (truong thpt)) dang cong sang toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hien hanh)) - hanh ((truong thanh) OR (truong thpt)) dang cong sang toan tap*.