Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nham thu, pham thuc
danh lai » danh sai, gianh lai, dinh lam
nam thuc » nam thuoc, am thuc, nam thu
tu sach » thu sach, su sach, te sach
hanh va » hang va
cu tren » tu tren, dua tren
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
lai hoi » dai hoi, lai hoa, lai roi
ty danh » ty doanh, ty anh, ky danh

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 ty danh lai hoi. hieu ve ((nham thuc) OR (nam thuc)) va ((hanh va) or (hanh vi)) cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty danh lai hoi. hieu ve ((nham thuc) OR (nam thuc)) va ((hanh va) OR (hanh vi)) cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty danh lai hoi. hieu ve ((nham thuc) OR (nam thuc)) va ((hanh va) or (hanh vi)) cu tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ty danh lai hoi. hieu ve ((nham thuc) OR (nam thuc)) va ((hanh va) or (hanh vi)) cu tren*.