Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chua xang » chua nang, chu bang, chua dong
cong manh » cong danh, duong manh, cong thanh
anh tang » anh bang, anh dang, anh nang
toan ban » van ban
tang va » trang va, tang van, thang va
chuc » thuc, chu, phuc

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: theo ((chua xang) OR (chuc nang)) - anh tang va nhung cong manh ((toan tap) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chua xang) or (chuc nang)) - anh tang va nhung cong manh ((toan tap) OR (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: theo ((chua xang) or (chuc nang)) - anh tang va nhung cong manh ((toan tap) OR (toan ban))*.