Perhaps you should try some spelling variations:
sach cam » sach cap, mach cam, sach tham
cam thuc » am thuc, nam thuc, cam thu
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
me hoi » le hoi
ve cam » ve cham, ve cac, va cam
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: vu sach cam nang ((me hoi) or (ma hoa)). hieu ve cam thuc va hanh ((vi cua) or (vai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach cam nang ((me hoi) OR (ma hoa)). hieu ve cam thuc va hanh ((vi cua) OR (vai cua)) triet.
• Adding a wildcard symbol may retrieve word variants: vu sach cam nang ((me hoi) or (ma hoa)). hieu ve cam thuc va hanh ((vi cua) or (vai cua)) triet*.