Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
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
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, me hoi

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 y nang ((ma hoi) OR (ma hoa)). hieu vu cham soc ((van hanh) or (gia thanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((ma hoi) OR (ma hoa)). hieu vu cham soc ((van hanh) OR (gia thanh)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((ma hoi) OR (ma hoa)). hieu vu cham soc ((van hanh) or (gia thanh)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((ma hoi) OR (ma hoa)). hieu vu cham soc ((van hanh) or (gia thanh)) vai cua tre*.