Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » thien van, lieu va, hieu ve
van dinh » van minh, van dich, va dinh
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ly nang xa hoi. ((hieu van) or (hieu va)) chao xu ((va tinh) or (van dinh)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ly nang xa hoi. ((hieu van) OR (hieu va)) chao xu ((va tinh) OR (van dinh)) va cua tre.
• Adding a wildcard symbol may retrieve word variants: thuat sach ly nang xa hoi. ((hieu van) or (hieu va)) chao xu ((va tinh) or (van dinh)) va cua tre*.