Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
thuc ban » thuoc ban, thuc dan, thu ban
ban hang » ngan hang
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di cua
de cua » le cua, te cua, dieu 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 thuc ban hang ((vi cua) or (de 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 thuc ban hang ((vi cua) OR (de 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 thuc ban hang ((vi cua) or (de cua)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. ((hieu va) OR (lieu va)) cam thuc ban hang ((vi cua) or (de cua)) triet*.