Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
qua cac » cua cac
cac dac » cac dan, cac dai, cac bac
dau dai » dat dai, sau dai, dau da
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
dac va » duc va, day va, dat va
va dau » va dao

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 x ho. hieu qua cac dac va dau dai cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x ho. hieu qua cac dac va dau dai cua tre*.