Perhaps you should try some spelling variations:
sach kho » bach khoa, sach dao, sach nha
kho tang » cao tang
dinh cho » dinh chon, danh cho, dinh chi
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
tu sach » thu sach, su sach, te sach
cho cua » co cua, chi cua, cho ca
va dinh » van dinh, va kinh, va tinh
cac xuc » cam xuc, chat xuc, cac cuoc
hieu va » lieu va
tang xa » trang xa, tang ma, lang xa
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: tu sach kho tang xa hoi. ((hieu va) OR (hieu qua)) ((cac xuc) or (cac nuoc)) va dinh cho cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach kho tang xa hoi. ((hieu va) OR (hieu qua)) ((cac xuc) OR (cac nuoc)) va dinh cho cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach kho tang xa hoi. ((hieu va) OR (hieu qua)) ((cac xuc) or (cac nuoc)) va dinh cho cua tre*".