Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
cua viet » ca viet, hoa viet, cua vat
tu sach » su sach, te sach, tu cach
cac duc » cac du, cao duc, cac dac
va danh » va dinh, va dan, va hanh
danh de » hanh de, dan de, dang de
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

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) or (thu sach)) ky nang x hoi. lieu va cac duc va danh de ((cua tre) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang x hoi. lieu va cac duc va danh de ((cua tre) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang x hoi. lieu va cac duc va danh de ((cua tre) or (cua viet))*.