Perhaps you should try some spelling variations:
tien manh » tien thanh, tieng anh, tran manh
dung cong » dung trong
tien anh » tieng anh, dien anh, tien thanh
anh tang » anh bang, anh dang, anh nang
tang cua » mang cua, hang cua, tang luan
cua dung » cua dang, cua dong, qua dung
cong tan » cong tac, cong san, cong thanh
toan cao » toan tap
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: hoc ((tien anh) OR (tien manh)) - anh tang cua dung cong tan ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((tien anh) OR (tien manh)) - anh tang cua dung cong tan ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((tien anh) OR (tien manh)) - anh tang cua dung cong tan ((toan cao) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc ((tien anh) OR (tien manh)) - anh tang cua dung cong tan ((toan cao) or (toan ban))*.