Perhaps you should try some spelling variations:
ban thanh » ban hanh
ban hang » ngan hang
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
ly nang » ly hang, ly vang, ly quang
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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 ((ly nang) OR (ky nang)) x hoi. hieu va cam tuc ((ban thanh) or (ban hang)) vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly nang) OR (ky nang)) x hoi. hieu va cam tuc ((ban thanh) OR (ban hang)) vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ly nang) OR (ky nang)) x hoi. hieu va cam tuc ((ban thanh) or (ban hang)) vi cua viet".
• Adding a wildcard symbol may retrieve word variants: su sach ((ly nang) OR (ky nang)) x hoi. hieu va cam tuc ((ban thanh) or (ban hang)) vi cua viet*.