Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
van thanh » van tuan
te sach » toc sach
sach ly » sach y, sach lo, sach ty
ly hang » ly quang
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ly hang ((xa hoi) or (ma hoa)). hieu vu cham soc ((van thanh) OR (ban thanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly hang ((xa hoi) OR (ma hoa)). hieu vu cham soc ((van thanh) OR (ban thanh)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ly hang ((xa hoi) or (ma hoa)). hieu vu cham soc ((van thanh) OR (ban thanh)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ly hang ((xa hoi) or (ma hoa)). hieu vu cham soc ((van thanh) OR (ban thanh)) vai cua tre*.