Perhaps you should try some spelling variations:
chat luc » chat xuc, chat lua, nhan luc
thai cua » than cua, tai cuc, tri cua
van dinh » van minh, van dich, va dinh
van sinh » van minh, va sinh, van binh
cua tre » cua te, cuu tre, cua triet
va chat » van chat, va phat, cao chat
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach tu, sach thu
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sac ky) or (sach ty)) lang xa hoi. lieu va chat luc ((van sinh) OR (van dinh)) thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sach ty)) lang xa hoi. lieu va chat luc ((van sinh) OR (van dinh)) thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) or (sach ty)) lang xa hoi. lieu va chat luc ((van sinh) OR (van dinh)) thai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (sach ty)) lang xa hoi. lieu va chat luc ((van sinh) OR (van dinh)) thai cua tre*.