Perhaps you should try some spelling variations:
ca thuong » cao thuong, cua thuong, va thuong
anh dang » anh dong, anh dung, anh bang
toan cau » toan cao, toan ban, toan tap
dang ca » dang cac, dan ca, hang ca
con van » chon van, cong van, con ban
can van » cac van, can ban, tan van
chuc » thuc, chu, chua

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hoat dong) or (chuc nang)) - anh dang ca thuong ((con van) OR (can van)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hoat dong) OR (chuc nang)) - anh dang ca thuong ((con van) OR (can van)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hoat dong) or (chuc nang)) - anh dang ca thuong ((con van) OR (can van)) toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((hoat dong) or (chuc nang)) - anh dang ca thuong ((con van) OR (can van)) toan cau*.