Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cham duc » pham duc, cham soc, pham duy
van hanh » ban hanh, van anh, van ban
su sach » so sach, vu sach
lam cua » nam cua, lam chat
hieu va » lieu va, hieu qua
va cham » va chat, va tham
van hoi » van hoa, van hoc, van hoe
ty hang » ly hang, ty xang, thi hang
ty tang » tay tang, ty xang, ky tang
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ty tang) or (ty hang)) van hoi. hieu va cham duc ((van hanh) OR (van thanh)) lam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty tang) OR (ty hang)) van hoi. hieu va cham duc ((van hanh) OR (van thanh)) lam cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty tang) or (ty hang)) van hoi. hieu va cham duc ((van hanh) OR (van thanh)) lam cua tre*".