Perhaps you should try some spelling variations:
chat thuc » thuat thuc, nhan thuc, chat thai
dinh kien » linh kien, dinh dien, dinh ket
doc sach » hoc sach, nuoc sach, dac sac
toc sach » hoc sach, thuoc sach, nuoc sach
ban dinh » ban tinh, van dinh, ban dich
thuc ban » thuoc ban, thuc dan, thu ban
cua tre » cuu tre, cua triet, dua tren
va chat » van chat, va phat, cao chat
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
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: ((doc sach) or (toc sach)) ty lang xa hoi. lieu va chat thuc ban dinh kien ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (toc sach)) ty lang xa hoi. lieu va chat thuc ban dinh kien ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: ((doc sach) or (toc sach)) ty lang xa hoi. lieu va chat thuc ban dinh kien ((cua tre) or (cua te))*.