Perhaps you should try some spelling variations:
van thanh » van tuan
ban thanh » ban hanh, ban hang
cham sac » cham soc, pham sach, cap sac
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
san cua » sang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky dang xa hoi. hieu vu cham sac ((van thanh) or (ban thanh)) san cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky dang xa hoi. hieu vu cham sac ((van thanh) OR (ban thanh)) san cua tre.
• Adding a wildcard symbol may retrieve word variants: tu san ky dang xa hoi. hieu vu cham sac ((van thanh) or (ban thanh)) san cua tre*.