Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
su sach » so sach, vu sach
ty nang » ky nang, ty hang, ly nang
hieu va » lieu va, hieu qua
va chay » va chat, va cham, va cay
dua ban » dia ban, cua ban, qua ban
san cua » sang cua, ban cua, dan cua
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) OR (ty xang)) xa hoi. hieu va chay dua ban thanh san cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty nang) OR (ty xang)) xa hoi. hieu va chay dua ban thanh san cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty nang) OR (ty xang)) xa hoi. hieu va chay dua ban thanh san cua tre*.