Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
cac lop » cac hop, cac loai
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu san, tu bac
lop va » lap va, hop va, nop va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((tu sac) or (thu sach))) or (tu cac)) ky nang xa hoi. hieu van cac lop va danh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sac) OR (thu sach))) OR (tu cac)) ky nang xa hoi. hieu van cac lop va danh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((((tu sac) or (thu sach))) or (tu cac)) ky nang xa hoi. hieu van cac lop va danh vi cua tre*.