Perhaps you should try some spelling variations:
ban hang » ngan hang
tuc ban » thuc ban, truc ban, tu ban
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cai
vi cua » vai cua
di cua » dai cua, doi cua, de cua
va cao » va cac, va co, va dao

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