Perhaps you should try some spelling variations:
ban hanh » ban hang
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
van cam » van lam, van cau, van dam
hoc ban » hoc bang, hoc dan, hoc bai
vai cua » dai cua, hai cua, lai cua
vi cua » di 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 ky lang xa hoi. hieu ((van cam) OR (van nam)) hoc ban hanh ((vi cua) or (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. hieu ((van cam) OR (van nam)) hoc ban hanh ((vi cua) OR (vai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. hieu ((van cam) OR (van nam)) hoc ban hanh ((vi cua) or (vai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. hieu ((van cam) OR (van nam)) hoc ban hanh ((vi cua) or (vai cua)) tre*.