Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van chao » van chat, van hao, van cho
van dinh » van minh, van dich, xuan dinh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
va dinh » va kinh, va tinh, vu dinh
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua
x hoi » xa hoi, o hoi, x ho
tinh » trinh, minh, kinh

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 ky nang x hoi. hieu van chao xu ((may tinh) or (((van dinh) OR (va dinh)))) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu van chao xu ((may tinh) OR (((van dinh) OR (va dinh)))) va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu van chao xu ((may tinh) or (((van dinh) OR (va dinh)))) va cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu van chao xu ((may tinh) or (((van dinh) OR (va dinh)))) va cua tre*.