Perhaps you should try some spelling variations:
canh manh » lanh manh, canh tranh, cach mang
trong tap » trong thap, tong tap, trong tai
trong tan » trong quan, trong cac, trong ca
hoc sach » hoc sinh, hoc cac, hoc anh
manh cua » doanh cua, ban cua
cua dung » cua dang, cua dong, qua dung
toan ban » van ban
doi hoc » doi hoac, dai hoc, hoi hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi hoc sach - canh manh cua dung ((trong tap) or (trong tan)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hoc sach - canh manh cua dung ((trong tap) OR (trong tan)) toan ban.
• Adding a wildcard symbol may retrieve word variants: doi hoc sach - canh manh cua dung ((trong tap) or (trong tan)) toan ban*.