Perhaps you should try some spelling variations:
ban thanh » ban hang
ban hanh » ban hang
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
tang ma » mang may, tang van
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
di cua » dai cua, doi cua, de cua

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 ((lang xa) or (tang ma)) hoi. hieu ve cam xuc ((ban hanh) or (ban thanh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((lang xa) OR (tang ma)) hoi. hieu ve cam xuc ((ban hanh) OR (ban thanh)) di cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((lang xa) or (tang ma)) hoi. hieu ve cam xuc ((ban hanh) or (ban thanh)) di cua tre*.