Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
cua viet » hoa viet, cua vat, cua dieu
thu sach » tu sach, thuat sach, thuoc sach
thuc va » thuc vat, thuc dan, thuc day
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
va nham » va cham, va tham, va nha
nang xa » nang x, lang xa, nang ma
ca viet » va viet, co viet, hoa viet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (thu sach)) ky nang xa hoi. lieu va nham thuc va hanh di ((cua viet) or (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thu sach)) ky nang xa hoi. lieu va nham thuc va hanh di ((cua viet) OR (ca viet)).
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thu sach)) ky nang xa hoi. lieu va nham thuc va hanh di ((cua viet) or (ca viet))*.