Perhaps you should try some spelling variations:
ban thanh » ban hang
ban hanh » ban hang
su sach » so sach, vu sach
san cua » sang cua, ban cua, dan cua
hieu va » lieu va, hieu qua
va chay » va chat, va cham, va cay
sach ty » sach y, sach tu, sach thu
nang xa » lang xa, nang ma, mang xa
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 ((nang xa) or (nang x)) hoi. hieu va chay dua ((ban thanh) OR (ban hanh)) san cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (nang x)) hoi. hieu va chay dua ((ban thanh) OR (ban hanh)) san cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang xa) or (nang x)) hoi. hieu va chay dua ((ban thanh) OR (ban hanh)) san cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) or (nang x)) hoi. hieu va chay dua ((ban thanh) OR (ban hanh)) san cua tre*.