Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trang » thanh trung, canh tranh, hanh trinh
hanh tang » anh tang, hanh mang, hanh tung
theo chu » theo chieu, cho chu, chao chu
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chu) or (theo tieu)) sach - ((hanh tang) OR (hanh trang)) va nhung cong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chu) OR (theo tieu)) sach - ((hanh tang) OR (hanh trang)) va nhung cong san toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chu) or (theo tieu)) sach - ((hanh tang) OR (hanh trang)) va nhung cong san toan ban".
• Adding a wildcard symbol may retrieve word variants: ((theo chu) or (theo tieu)) sach - ((hanh tang) OR (hanh trang)) va nhung cong san toan ban*.