Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
cham duc » pham duc, cham soc, pham duy
thao hoc » thai hoc, than hoc, thao khoa
tu cach » tu cac
duc gia » quoc gia
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
cua tre » cua te, cuu tre, cua triet
ky sang » ky nang, ky dang, ky tang
su sach » so sach, vu sach
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 cach) or (su sach)) ky sang ((thao hoc) or (tao boi)). hieu vu cham duc gia thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (su sach)) ky sang ((thao hoc) OR (tao boi)). hieu vu cham duc gia thanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (su sach)) ky sang ((thao hoc) or (tao boi)). hieu vu cham duc gia thanh vi cua tre*.