Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
sach tao » sach dao, sach bao, sach tai
van hanh » ban hanh, van anh, van ban
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
tao tao » dao tao, tao cao, tai tao
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao
bac ho » bac bo, bac ha
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach tao tao bac ho. hieu ((ve cam) OR (va cam)) xuc ((van hanh) or (van thanh)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tao tao bac ho. hieu ((ve cam) OR (va cam)) xuc ((van hanh) OR (van thanh)) va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tao tao bac ho. hieu ((ve cam) OR (va cam)) xuc ((van hanh) or (van thanh)) va cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach tao tao bac ho. hieu ((ve cam) OR (va cam)) xuc ((van hanh) or (van thanh)) va cua tre*.