Perhaps you should try some spelling variations:
thuc xanh » thuc hanh, thuc thanh, thuc dan
dung cong » dung trong
hoc thuc » hoc huu
dang van » hoang 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: hoc thuc xanh - hanh ((dang van) or (ban va)) dung cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thuc xanh - hanh ((dang van) OR (ban va)) dung cong dan toan cau*.