Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va nang » van nang, da nang, cam nang
cac tuc » cac toc, cac tu, cac tac
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cua tre » cuu tre, cua triet, dua tren
v nang » vu nang, van nang, voi nang
tuc va » thuc va, truc va, tuc xa
cua te » cua tu

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 ((v nang) or (va nang)) xa hoi. lieu va cac tuc va danh vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((v nang) OR (va nang)) xa hoi. lieu va cac tuc va danh vi ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: toc sach ((v nang) or (va nang)) xa hoi. lieu va cac tuc va danh vi ((cua tre) or (cua te))*.