Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
qua cac » cua cac
cac tuc » cac toc, cac tu, cac tac
xa hanh » xa thanh, xa khanh, va hanh
hanh ca » hanh cac, hanh cat, hanh cua
cua tre » cua te, cuu tre, cua triet
y nang » ly nang, v nang, may nang
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 ((y nang) or (ky nang)) ((le hoi) or (ma hoa)). hieu qua cac tuc xa hanh ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ky nang)) ((le hoi) OR (ma hoa)). hieu qua cac tuc xa hanh ca cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (ky nang)) ((le hoi) or (ma hoa)). hieu qua cac tuc xa hanh ca cua tre*.