Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
danh dau » lanh dao, hang dau, danh tu
dinh dau » dinh dat, dinh du, dinh dao
van tham » van thanh, van tuan, van chat
tham tuc » tham thuc, thai tuc, nham thuc
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cua triet, dua tren
thi van » thi lan, thi hanh, thi nang
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cuu tre » cau tren, cau treo
tuc va » thuc va, truc va, tuc xa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty nang xa hoi. thi van tham tuc va ((dinh dau) or (danh dau)) ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang xa hoi. thi van tham tuc va ((dinh dau) OR (danh dau)) ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang xa hoi. thi van tham tuc va ((dinh dau) or (danh dau)) ((cua tre) or (cuu tre))*.