Perhaps you should try some spelling variations:
nhiem trong » nghiep trong
nhiem tang » nhieu tang, nhiem trung, hiem hang
nhung cong » dung cong, thong cong, hang cong
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: thai ((nhiem tang) OR (nhiem trong)) - hanh ((trang va) or (tran van)) nhung cong tan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thai ((nhiem tang) OR (nhiem trong)) - hanh ((trang va) OR (tran van)) nhung cong tan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thai ((nhiem tang) OR (nhiem trong)) - hanh ((trang va) or (tran van)) nhung cong tan toan ban".
• Adding a wildcard symbol may retrieve word variants: thai ((nhiem tang) OR (nhiem trong)) - hanh ((trang va) or (tran van)) nhung cong tan toan ban*.