Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nham thu, pham thuc
cua viet » ca viet, hoa viet, cua vat
vat dinh » va dinh, van dinh, vat sinh
nam thuc » nam thuoc, am thuc, nam thu
thu sach » tu sach, thuat sach, thuoc sach
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
dinh de » dinh ve, dinh du, dinh le
so sach » so sanh, bo sach, co sach
ma hoi » mai hoi, xa hoi, ma hoa
de cua » le cua, te cua, dieu 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 tang ma hoi. lieu va ((nham thuc) or (nam thuc)) vat dinh de cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (thu sach)) ky tang ma hoi. lieu va ((nham thuc) OR (nam thuc)) vat dinh de cua viet.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (thu sach)) ky tang ma hoi. lieu va ((nham thuc) or (nam thuc)) vat dinh de cua viet*.