Perhaps you should try some spelling variations:
dang cong » dung cong
theo dieu » theo tieu, theo chieu, thuoc dieu
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
tang va » tang van, thang va, tang vat

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

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