Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tieu sang » chieu sang, tieu dung, tiem nang
mang vua » mang cua, hang va, bang va
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
mang va » hang va, bang va, dang va

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sang - hang ((mang va) OR (mang vua)) nhung cong tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sang - hang ((mang va) OR (mang vua)) nhung cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: theo tieu sang - hang ((mang va) OR (mang vua)) nhung cong tac toan cau*.