Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
thanh tai » thanh hai, thanh toan, doanh tai
sach tu » sach thu, cach tu, sach ty
tang ma » mang may, tang van
lang xa » lang ha, dang xay, lang van
qua cac » cua cac
cac duc » cac du, cao duc, cac dac
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo

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) or (sach tu)) ((tang ma) or (lang xa)) hoi. hieu qua cac duc tan thanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach y) OR (sach tu)) ((tang ma) OR (lang xa)) hoi. hieu qua cac duc tan thanh tai cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sach tu)) ((tang ma) or (lang xa)) hoi. hieu qua cac duc tan thanh tai cuu tre*.