Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
hieu de » hieu ve, hieu he, hieu le
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
xu gia » xu giao, vu gia
de co » ke co
co xu » co xua, co tu, co su

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 ty ((nang ma) or (nang x)) hoi. hieu de co xu gia thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang ma) OR (nang x)) hoi. hieu de co xu gia thanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang ma) or (nang x)) hoi. hieu de co xu gia thanh tai cua tre*.