Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh tai » thanh hai, thanh toan, doanh tai
va thanh » gia thanh, ban thanh, va tinh
tai cua » thai cua, tai cuc, tri cua
cac dac » cac dan, cac dai, cac bac
sach ty » sach y, sach tu, sach thu
cac duc » cac du, cao duc, cac nuoc
tang ma » mang may, tang van
lang xa » lang ha, dang xay, lang van
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: thuat sach ty ((tang ma) or (lang xa)) hoi. lieu va ((cac duc) or (cac dac)) va thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ty ((tang ma) OR (lang xa)) hoi. lieu va ((cac duc) OR (cac dac)) va thanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: thuat sach ty ((tang ma) or (lang xa)) hoi. lieu va ((cac duc) or (cac dac)) va thanh tai cua tre*.