Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
canh trang » canh tranh, hanh trang, banh trang
dung cong » dung trong
hoc hieu » hoc thieu, doc hieu, hoc dieu
trang va » tran van, hang va
van tuan » van quan, van ban, anh tuan
tuan ban » tuan bang, toan ban, luan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc hieu) or (hoc hien)) lang - canh trang va ((thong cong) or (dung cong)) van tuan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hieu) OR (hoc hien)) lang - canh trang va ((thong cong) OR (dung cong)) van tuan ban.
• Adding a wildcard symbol may retrieve word variants: ((hoc hieu) or (hoc hien)) lang - canh trang va ((thong cong) or (dung cong)) van tuan ban*.