Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, khau sach
hieu van » hieu va, thien van, lieu va
tu sach » su sach, te sach, tu cach
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc 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 sach) or (thu sach))) or (thu hoach)) ty nang xa hoi. hieu van cam xuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (thu sach))) OR (thu hoach)) ty nang xa hoi. hieu van cam xuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) or (thu sach))) or (thu hoach)) ty nang xa hoi. hieu van cam xuc va hanh vi cua tre*.