Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ty nang » ty xang, ty hang, ly nang
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
dinh vi » dinh ve, dinh viet, dinh tri
cua tre » cua te, cuu tre, cua triet
soc va » hoc va, loc va, doc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((ty nang) OR (ky nang)) xa hoi. hieu ve cham soc va ((dinh vi) or (chinh tri)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ty nang) OR (ky nang)) xa hoi. hieu ve cham soc va ((dinh vi) OR (chinh tri)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ty nang) OR (ky nang)) xa hoi. hieu ve cham soc va ((dinh vi) or (chinh tri)) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ty nang) OR (ky nang)) xa hoi. hieu ve cham soc va ((dinh vi) or (chinh tri)) cua tre*.