Perhaps you should try some spelling variations:
thuoc tai » nuoc tai, hoc tai, thuoc ma
hang hai » hoang hai, hang tai, thanh hai
tu sach » thu sach, su sach, te sach
hieu vu » hieu va, hieu ve, hieu su
thuc va » thuc vat, thuc dan, thuc day
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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 vu bach ((thuoc tai) or (thuc va)) hang hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x ho. hieu vu bach ((thuoc tai) OR (thuc va)) hang hai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x ho. hieu vu bach ((thuoc tai) or (thuc va)) hang hai cua tre*.