Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
van nang » van quang, van ban, van dong
hieu van » hieu va, thien van, lieu va
van nham » van nam, van nhan, van tham
su sach » so sach, vu sach
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
v nang » va nang, vu nang, voi nang
vi cua » vai cua
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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) OR (van nang)) x hoi. hieu van nham thuc va hanh ((vi cua) or (di cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((v nang) OR (van nang)) x hoi. hieu van nham 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) OR (van nang)) x hoi. hieu van nham thuc va hanh ((vi cua) or (di cua)) te".
• Adding a wildcard symbol may retrieve word variants: su sach ((v nang) OR (van nang)) x hoi. hieu van nham thuc va hanh ((vi cua) or (di cua)) te*.