Perhaps you should try some spelling variations:
thuoc sinh » hoc sinh, thu sinh, thuoc sach
nuoc sach » nguoi sach, hoc sach, cuoc cach
tranh cua » doanh cua, manh cua
tong song » tong cong, dong song, tong son
song song » song hong, song dong, xuong song
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 ((nuoc sach) or (thuoc sinh)) - canh tranh cua ((tong song) OR (song song)) van toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((nuoc sach) OR (thuoc sinh)) - canh tranh cua ((tong song) OR (song song)) van toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((nuoc sach) or (thuoc sinh)) - canh tranh cua ((tong song) OR (song song)) van toan ban".
• Adding a wildcard symbol may retrieve word variants: theo ((nuoc sach) or (thuoc sinh)) - canh tranh cua ((tong song) OR (song song)) van toan ban*.