Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hoc chieu » ho chieu, hoc hien, hoc dieu
hoc thieu » toc thieu, hoc hien
hanh tang » hanh trang, anh tang, hanh mang
cong cong » cong dong, trong cong, dung cong
tang cua » mang cua, hang cua, tang luan
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 chieu) OR (hoc thieu)) sach - hanh tang cua ((thong cong) or (cong cong)) doan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chieu) OR (hoc thieu)) sach - hanh tang cua ((thong cong) OR (cong cong)) doan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chieu) OR (hoc thieu)) sach - hanh tang cua ((thong cong) or (cong cong)) doan van ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc chieu) OR (hoc thieu)) sach - hanh tang cua ((thong cong) or (cong cong)) doan van ban*.