Perhaps you should try some spelling variations:
chiet tach » chieu sach
nhieu tang » chieu sang, hieu lang, nhiet nang
dung cong » dung trong
trang va » hang va
tran van » luan van
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chiet tach) or (nhieu tang)) - anh ((trang va) OR (tran van)) dung cong tan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chiet tach) OR (nhieu tang)) - anh ((trang va) OR (tran van)) dung cong tan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chiet tach) or (nhieu tang)) - anh ((trang va) OR (tran van)) dung cong tan toan ban".
• Adding a wildcard symbol may retrieve word variants: ho ((chiet tach) or (nhieu tang)) - anh ((trang va) OR (tran van)) dung cong tan toan ban*.