Perhaps you should try some spelling variations:
ban hang » ngan hang
su sach » so sach, vu sach
cac duc » cac du, cao duc, cac dac
hai cua » thai cua, dai cua, hoi cua
vai cua » dai cua, lai cua, bai cua
duc ban » duc tan, duc van, dua ban
sach ty » sach y, sach tu, sach thu
hieu va » lieu va
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang

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 hoi. ((hieu va) OR (hieu qua)) cac duc ban hang ((vai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. ((hieu va) OR (hieu qua)) cac duc ban hang ((vai cua) OR (hai cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. ((hieu va) OR (hieu qua)) cac duc ban hang ((vai cua) or (hai cua)) tre*".