Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, dia danh
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
va hanh » van hanh, va thanh, ban hanh
ve nam » he nam, va nam, le nam
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: tu sach ky lang xa hoi. hieu ve nam thuc ((va hanh) or (va danh)) ((vi cua) OR (vai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang xa hoi. hieu ve nam thuc ((va hanh) OR (va danh)) ((vi cua) OR (vai cua)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang xa hoi. hieu ve nam thuc ((va hanh) or (va danh)) ((vi cua) OR (vai cua)) triet*".