Perhaps you should try some spelling variations:
cang thang » cong thanh, dang thanh
chiet tach » chieu sach
hoc chiet » hoc thiet, hoc nhiet, hoc hien
manh hung » anh huong
cap thang » cau thang, nam thang, van thang
cong doan » cong dan, cong hoan, dong doanh
doan van » doan va, hoang van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chiet tach - manh hung ((cap thang) or (cang thang)) cong doan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - manh hung ((cap thang) OR (cang thang)) cong doan van ban.
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - manh hung ((cap thang) or (cang thang)) cong doan van ban*.