Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
sach vay » sach va, sach hay, sach nay
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
ve cham » va cham, ve chat, vu cham
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
sach 2 » sach y
vi cua » di 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 vay) or (sach 2)) nang xa hoi. hieu ve cham thuc va hanh ((vi cua) OR (vai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach vay) OR (sach 2)) nang xa hoi. hieu ve cham thuc va hanh ((vi cua) OR (vai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach vay) or (sach 2)) nang xa hoi. hieu ve cham thuc va hanh ((vi cua) OR (vai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach vay) or (sach 2)) nang xa hoi. hieu ve cham thuc va hanh ((vi cua) OR (vai cua)) triet*.