Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
trong dai » truong dai, trong doi, trong hai
trong dam » trong lam, trong nam, trong cac
dang cong » dung cong
hoc hieu » hoc thieu, hoc hien, doc hieu
cong dan » cong san, cong tan, huong dan
toan cau » toan ban, toan tap, toan tai
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 - hanh ((trong dai) OR (trong dam)) dang cong dan ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - hanh ((trong dai) OR (trong dam)) dang cong dan ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - hanh ((trong dai) OR (trong dam)) dang cong dan ((toan cau) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - hanh ((trong dai) OR (trong dam)) dang cong dan ((toan cau) or (toan cao))*.