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

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) OR (vu sach)) v ((nang o) OR (nang co)) hoi. hieu van nam thuc va hanh vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) v ((nang o) or (nang co)) hoi. hieu van nam thuc va hanh vi cua te~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) v ((nang o) or (nang co)) hoi. hieu van nam thuc va hanh vi cua te*.