Perhaps you should try some spelling variations:
dung cong » dung trong
choi thuc » hoc thuc, hoi chuc, cho thue
thuc dan » thuc hanh, hoc dan, thuc vat
trang va » tran van, hang va
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: choi thuc dan - hanh ((ban va) or (trang va)) dung cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: choi thuc dan - hanh ((ban va) OR (trang va)) dung cong dan toan cau*.