Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cham giua » tham gia, nhat giua, cam gia
thu sach » thuat sach, thuoc sach, thu hoach
giua ban » giup ban, dia ban, cua ban
va cham » va chat, va tham
tu sach » su sach, te sach, tu cach
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
hieu va » lieu va, hieu qua
ha hoi » hoa hoi, ha noi, xa hoi
va cua » va chua, via cua, ca cua
co cua » con cua, ca cua, cong cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) ky lang ha hoi. hieu va cham giua ban thanh ((va cua) or (co cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky lang ha hoi. hieu va cham giua ban thanh ((va cua) OR (co cua)) triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky lang ha hoi. hieu va cham giua ban thanh ((va cua) or (co cua)) triet*.