Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hoc sach » hoc sinh, hoc cac, hoc anh
dang mai » dang hai, dang mau, dang bai
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, va tinh, le thanh
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
mai hoi » mai khoi, dai hoi, lai hoi
van cam » van nam, van lam, van cau
vai cua » hai cua, lai cua, bai cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky dang mai hoi. hieu van cam xuc ((va thanh) or (ban thanh)) ((vai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky dang mai hoi. hieu van cam xuc ((va thanh) OR (ban thanh)) ((vai cua) OR (dai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach ky dang mai hoi. hieu van cam xuc ((va thanh) or (ban thanh)) ((vai cua) or (dai cua)) tre*.