Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
tai cua » thai cua, tai cuc, tri cua
cam luc » cau luc
sach ky » sac ky, sach y, sach ty
dang xa » dang xay, dang ha, dang va
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: su sach ky ((dang xa) or (lang xa)) hoi. hieu qua ((cam luc) or (cam xuc)) va thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((dang xa) OR (lang xa)) hoi. hieu qua ((cam luc) OR (cam xuc)) va thanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((dang xa) or (lang xa)) hoi. hieu qua ((cam luc) or (cam xuc)) va thanh tai cua tre*.