Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
qua cac » cua cac
cac tac » cac toc, cac bac, cac dac
va hanh » van hanh, va thanh, va danh
hanh ca » hanh cac, hanh cat, hanh cua
cua tre » cua te, cuu tre, cua triet
me hoi » le hoi
tac va » tac da, tac xa, tuc va
ca cua » co cua

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 ty nang ((me hoi) or (ma hoa)). hieu qua cac tac va hanh ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((me hoi) OR (ma hoa)). hieu qua cac tac va hanh ca cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((me hoi) or (ma hoa)). hieu qua cac tac va hanh ca cua tre*.