Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
dung cong » dung trong
tang cua » hang cua, tang luan, thong cua
mang cua » manh cua, dung cua, ban cua
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » 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: theo ((hieu manh) or (chinh sach)) - hanh ((tang cua) or (mang cua)) dung cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu manh) OR (chinh sach)) - hanh ((tang cua) OR (mang cua)) dung cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: theo ((hieu manh) or (chinh sach)) - hanh ((tang cua) or (mang cua)) dung cong tac toan cau*.