Perhaps you should try some spelling variations:
sach kho » bach khoa, sach dao, sach nha
kho tang » cao tang
trinh vi » trinh va, trinh ve, trinh viet
hieu van » hieu va, thien van, hieu ve
va trinh » van trinh, va tinh, lap trinh
su sach » so sach, vu sach
bao luc » bao thuc
bao loc » bao goc, bao hoc, bao lac
tang xa » trang xa, tang ma, lang xa
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach kho tang xa hoi. ((hieu van) OR (lieu va)) ((bao loc) OR (bao luc)) va trinh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach kho tang xa hoi. ((hieu van) OR (lieu va)) ((bao loc) or (bao luc)) va trinh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach kho tang xa hoi. ((hieu van) OR (lieu va)) ((bao loc) or (bao luc)) va trinh vi cua tre*.