Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, pham thuc
cua viet » ca viet, hoa viet, cua vat
thu sach » tu sach, thuat sach, thuoc sach
vat dinh » va dinh, van dinh, vat sinh
nham thu » nam thu, pham thu, nhan thuc
dinh di » dinh du, dinh vi, danh di
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, doi cua, de cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (thu sach)) ky nang ma hoi. lieu va ((nham thuc) OR (nham thu)) vat dinh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (thu sach)) ky nang ma hoi. lieu va ((nham thuc) OR (nham thu)) vat dinh di cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (thu sach)) ky nang ma hoi. lieu va ((nham thuc) OR (nham thu)) vat dinh di cua viet*".