Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
truc van » truc va, thuc van, truc ban
dao truc » dao tuc, dao tru, dai truc
van anh » van thanh, tuan anh, van minh
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va
xang xa » lang xa, mang xa, ang xa
anh vi » hanh vi, anh va, anh ve
vi cua » vai cua, di cua

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) or (thuoc sach)) ty xang xa hoi. ((hieu va) OR (hieu qua)) dao truc van anh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) ty xang xa hoi. ((hieu va) OR (hieu qua)) dao truc van anh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thuoc sach)) ty xang xa hoi. ((hieu va) OR (hieu qua)) dao truc van anh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuoc sach)) ty xang xa hoi. ((hieu va) OR (hieu qua)) dao truc van anh vi cua tre*.