Perhaps you should try some spelling variations:
ban hang » ngan hang
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
cam tuc » cam xuc, cam tu, nam thuc
tuc ban » thuc ban, truc ban, tu ban
y nang » ky nang, ly nang, v nang
va cua » va chua, via cua, ma cua
ca cua » co 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 y nang xa hoi. ((hieu va) or (lieu va)) cam tuc ban hang ((va cua) OR (ca cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. ((hieu va) OR (lieu va)) cam tuc ban hang ((va cua) OR (ca cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. ((hieu va) or (lieu va)) cam tuc ban hang ((va cua) OR (ca cua)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. ((hieu va) or (lieu va)) cam tuc ban hang ((va cua) OR (ca cua)) triet*.