Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
lanh tranh » lan tranh, hanh trinh, sach tranh
cua nhung » va nhung
chi sang » chi lang, chieu sang, chi chang
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cau » toan cao, toan ban, toan tap
doi chi » doi khi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sang - ((lanh tranh) OR (canh tranh)) cua nhung cong tap toan cau~.
• Adding a wildcard symbol may retrieve word variants: doi chi sang - ((lanh tranh) or (canh tranh)) cua nhung cong tap toan cau*.