Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
thu sach » tu sach, thuat sach, thuoc sach
bach duc » bach tuoc, sach duoc, thach duc
kho tang » cao tang
thanh va » thanh van, thanh ha, thanh ve
sach kho » bach khoa, sach dao, sach nha
hanh va » hang va, hanh vi
duc ban » duc tan, duc van, dua ban
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach kho tang xa hoi. ((hieu hien) or (hieu ve)) bach duc ban ((thanh va) OR (hanh va)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach kho tang xa hoi. ((hieu hien) OR (hieu ve)) bach duc ban ((thanh va) OR (hanh va)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach kho tang xa hoi. ((hieu hien) or (hieu ve)) bach duc ban ((thanh va) OR (hanh va)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu sach kho tang xa hoi. ((hieu hien) or (hieu ve)) bach duc ban ((thanh va) OR (hanh va)) cuu tre*.