Perhaps you should try some spelling variations:
dang cong » dung cong
huong cua » dung cua
theo chu » theo chieu, cho chu, chao chu
chu xanh » chu manh, chieu xanh, chua xang
tang cua » mang cua, hang cua, tang luan
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 chu xanh - anh ((tang cua) or (huong cua)) dang cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu xanh - anh ((tang cua) OR (huong cua)) dang cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: theo chu xanh - anh ((tang cua) or (huong cua)) dang cong tac toan cau*.