Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach, vu sach
nang co » nang cao, nang doc, nang noi
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
sach v » sach va, sach y, sach 2
nang o » nang ho, nang ro, nang x
vi cua » vai cua
di cua » dai cua, doi cua, de cua

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v ((nang o) OR (nang co)) hoi. hieu van nam thuc va hanh ((vi cua) OR (di cua)) te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v ((nang o) or (nang co)) hoi. hieu van nam thuc va hanh ((vi cua) OR (di cua)) te~".
• Adding a wildcard symbol may retrieve word variants: su sach v ((nang o) or (nang co)) hoi. hieu van nam thuc va hanh ((vi cua) OR (di cua)) te*.