Perhaps you should try some spelling variations:
kham vuc » kham cuoc, khu vuc, pham vu
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu vu » hieu va, hieu ve, hieu su
vu kham » vu khanh
vuc van » duc van, luc van, thuc van
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, ma hoa, me hoi
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 ky nang ((ma hoi) or (xa hoi)). hieu vu kham vuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ma hoi) OR (xa hoi)). hieu vu kham vuc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ma hoi) or (xa hoi)). hieu vu kham vuc van hanh vi cua tre*.