Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
song cua » cong cua, dong cua, huong cua
su sach » vu sach
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va chay » va chat, va cham, va cay
dua ban » dia ban, cua ban, qua ban
son cua » con cua, san cua, lon 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) or (so sach)) ky nang xa hoi. hieu va chay dua ban thanh ((son cua) OR (song cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky nang xa hoi. hieu va chay dua ban thanh ((son cua) OR (song cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ky nang xa hoi. hieu va chay dua ban thanh ((son cua) OR (song cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky nang xa hoi. hieu va chay dua ban thanh ((son cua) OR (song cua)) tre*.