Perhaps you should try some spelling variations:
thanh trung » thanh tung
hanh trang » canh tranh, hanh trinh, minh trang
nhung cong » dung cong, thong cong, hang cong
hoc chieu » hoc thieu, hoc hien, hoc dieu
cua nhung » va nhung
cong doan » cong dan, cong hoan, dong doanh
ho chieu » theo chieu, hoc thieu, doi chieu
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 (ho chieu)) sach - ((hanh trang) or (thanh trung)) cua nhung cong doan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chieu) OR (ho chieu)) sach - ((hanh trang) OR (thanh trung)) cua nhung cong doan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chieu) OR (ho chieu)) sach - ((hanh trang) or (thanh trung)) cua nhung cong doan van ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc chieu) OR (ho chieu)) sach - ((hanh trang) or (thanh trung)) cua nhung cong doan van ban*.