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 tu » cua tuc, cua su, cua cu

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 tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty nang) OR (ty xang)) xa hoi. hieu va chay dua ban thanh san cua tu.
• 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 tu*.