Perhaps you should try some spelling variations:
thiet tach » thien hach, thuat tach
chiet tach » chieu sach
nhung cong » dung cong, thong cong, nhung don
thanh toan » thanh hoa, thanh san, tinh toan
hanh tang » hanh trang, anh tang, hanh mang
hang cong » dang cong, hang nong, bang cong
tang cua » mang cua, hang cua, tang luan
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 ((thiet tach) or (chiet tach)) - hanh tang cua ((nhung cong) OR (hang cong)) thanh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet tach) OR (chiet tach)) - hanh tang cua ((nhung cong) OR (hang cong)) thanh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet tach) or (chiet tach)) - hanh tang cua ((nhung cong) OR (hang cong)) thanh toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet tach) or (chiet tach)) - hanh tang cua ((nhung cong) OR (hang cong)) thanh toan ban*.