Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
tranh cua » doanh cua, manh cua
tong cong » trong cong, cong cong, dang cong
dung cong » dung trong
doc sach » hoc sach, toc sach, nuoc sach
van toan » van tuan, van tan, van thanh
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 ((doc sach) or (thuat sach)) - canh tranh cua ((tong cong) OR (dung cong)) van toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((doc sach) OR (thuat sach)) - canh tranh cua ((tong cong) OR (dung cong)) van toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((doc sach) or (thuat sach)) - canh tranh cua ((tong cong) OR (dung cong)) van toan ban".
• Adding a wildcard symbol may retrieve word variants: theo ((doc sach) or (thuat sach)) - canh tranh cua ((tong cong) OR (dung cong)) van toan ban*.