Perhaps you should try some spelling variations:
thieu tach » thien hach, chiet tach, hieu cach
chieu sach » chinh sach, chiet tach, chieu sang
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
dung cong » dung trong
manh toan » thanh toan, anh tuan, tinh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu tach) OR (chieu sach)) - hanh tang luan ((nhung bai) or (dung cong)) manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu tach) OR (chieu sach)) - hanh tang luan ((nhung bai) OR (dung cong)) manh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu tach) OR (chieu sach)) - hanh tang luan ((nhung bai) or (dung cong)) manh toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu tach) OR (chieu sach)) - hanh tang luan ((nhung bai) or (dung cong)) manh toan cao*.