Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van chat » cao chat
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
chat xu » chat xuc, chao xu, chat huu
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: thu sach ky nang xa hoi. hieu van chat xu ((va tinh) or (van minh)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu van chat xu ((va tinh) OR (van minh)) va cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu van chat xu ((va tinh) or (van minh)) va cua tre*.