Perhaps you should try some spelling variations:
ban thanh » ban hang
cham duc » pham duc, cham soc, pham duy
ban hanh » ban hang
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
ty hang » ly hang, ty xang, thi hang
hang xa » hoang xa, hang va, hang ca
hieu va » lieu va, hieu qua
va cham » va chat, va tham
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ty hang xa hoi. hieu va cham duc ((ban thanh) or (ban hanh)) vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty hang xa hoi. hieu va cham duc ((ban thanh) OR (ban hanh)) vi ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: vu sach ty hang xa hoi. hieu va cham duc ((ban thanh) or (ban hanh)) vi ((cua tre) or (cua te))*.