Perhaps you should try some spelling variations:
hieu doc » hieu dac, hieu hoc, nhieu goc
doc chat » hoc chat, hop chat, toc cham
chat xuc » chat huu, cam xuc, chao xu
tu cach » tu cac
so sach » so sanh, bo sach, co sach
xuc van » duc van, luc van, vuc van
minh ve » dinh ve, minh va, kinh ve
cua tre » cua te, cuu tre, cua triet
ve cua » le cua, de cua, te 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 cach) or (so sach)) ky nang x hoi. hieu doc chat xuc van minh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (so sach)) ky nang x hoi. hieu doc chat xuc van minh ve cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (so sach)) ky nang x hoi. hieu doc chat xuc van minh ve cua tre*.