Perhaps you should try some spelling variations:
kien sach » dien sach, vien bach, kien mac
hanh tang » hanh trang, anh tang, hanh mang
van nhung » van nhuong, va nhung, van hung
hoc kien » hoc hien, hoc vien, hoa kien
tang van » dang van, hoang van, trong van
cong san » cong tac
song van » hoang van, trong van, duong van
tai cao » thai cao, tai sao, tai cac
tao cao » bao cao, toan cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc kien sach - hanh tang van nhung ((cong san) or (song van)) ((tai cao) or (tao cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc kien sach - hanh tang van nhung ((cong san) OR (song van)) ((tai cao) OR (tao cao)).
• Adding a wildcard symbol may retrieve word variants: hoc kien sach - hanh tang van nhung ((cong san) or (song van)) ((tai cao) or (tao cao))*.