Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
sach v » sach va, sach y, sach 2
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: su sach v ((nang xa) OR (nang x)) hoi. 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: su sach v ((nang xa) OR (nang x)) hoi. hieu ve cam thuc va hanh ((vi cua) OR (vai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v ((nang xa) OR (nang x)) hoi. hieu ve cam thuc va hanh ((vi cua) or (vai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach v ((nang xa) OR (nang x)) hoi. hieu ve cam thuc va hanh ((vi cua) or (vai cua)) triet*.