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, va dinh
tu sach » thu sach, su sach, te sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua
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 ly nang x hoi. hieu van chao xu ((((va tinh) or (may tinh))) or (van dinh)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly nang x hoi. hieu van chao xu ((((va tinh) OR (may tinh))) OR (van dinh)) va cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ly nang x hoi. hieu van chao xu ((((va tinh) or (may tinh))) or (van dinh)) va cua tre*.