Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
van thanh » van tuan
hieu van » hieu va, thien van, lieu va
van tham » van tuan, van chat, van tai
tham soc » cham soc, tham nuoc, thai son
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
cua tre » cua te, cuu tre, cua triet
te cac » tu cac, ve cac, te cao
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: te cac ky dang xa hoi. hieu van tham soc ((van thanh) or (ban thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ky dang xa hoi. hieu van tham soc ((van thanh) OR (ban thanh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te cac ky dang xa hoi. hieu van tham soc ((van thanh) or (ban thanh)) vi cua tre*.