Perhaps you should try some spelling variations:
hang cong » dang cong, hang nong, bang cong
theo chu » theo chieu, cho chu, chao chu
chu xanh » chu manh, chieu xanh, chua xang
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
manh va » hanh va, anh va, lanh va
minh va » tinh va, sinh va, sinh vat

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 - hanh ((manh va) or (minh va)) hang cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu xanh - hanh ((manh va) OR (minh va)) hang cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: theo chu xanh - hanh ((manh va) or (minh va)) hang cong tac toan cau*.