Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
hieu phan » phieu phan, lieu phan, hieu pham
va thanh » gia thanh, ban thanh, va tinh
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
tu truc » cau truc, tu thuoc, tu trung
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet

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) or (cac ky)) nang cao hoi. hieu phan tu truc va thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (cac ky)) nang cao hoi. hieu phan tu truc va thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (cac ky)) nang cao hoi. hieu phan tu truc va thanh dai cua tre*.