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