Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hanh dung » thanh dung, anh dung, hanh dong
dung cong » dung trong
vang phan » van phan, nang phan, quang phan
choi thu » choi thuc, choi tu, choi chu
thu hang » thi hang, thuc hanh, thu huong
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: choi thu hang - hanh dung va ((thong cong) or (dung cong)) vang phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: choi thu hang - hanh dung va ((thong cong) OR (dung cong)) vang phan dau*.