Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cam thuc » nam thuc, cam thu, can thuc
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
via cua » gia cua, gian cua, giau cua
va cua » va chua, ca cua, ma 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 ky nang xa hoi. hieu ve ((cam thuc) or (am thuc)) ban thanh ((va cua) OR (via cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu ve ((cam thuc) OR (am thuc)) ban thanh ((va cua) OR (via cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu ve ((cam thuc) or (am thuc)) ban thanh ((va cua) OR (via cua)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu ve ((cam thuc) or (am thuc)) ban thanh ((va cua) OR (via cua)) triet*.