Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
nang xa » lang xa, nang ma, mang xa
hieu va » lieu va, hieu qua
va cham » va chat, va tham
soc ban » hoc ban, coc ban, so ban
su tien » su hien, tu tieng, dau tien
kien » bien, vien, dien

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 thue ((nang xa) or (nang x)) hoi. hieu va cham soc ban hanh vi ((su tien) or (su kien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thue ((nang xa) OR (nang x)) hoi. hieu va cham soc ban hanh vi ((su tien) OR (su kien)).
• Adding a wildcard symbol may retrieve word variants: tu sach thue ((nang xa) or (nang x)) hoi. hieu va cham soc ban hanh vi ((su tien) or (su kien))*.