Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
va danh » va dinh, va dan, dia danh
sach lo » sach dao, sach doi, sach hoi
va hanh » van hanh, ban hanh, dao hanh
hieu va » lieu va, hieu qua
lo nang » ho nang, ly nang, loai nang
su viet » so viet
va nam » van nam, ha nam, va nay
x hoi » xa hoi, o hoi, x ho
di su » doi su, ki su, da su

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