Perhaps you should try some spelling variations:
sach tham » sach nha
tham mang » tham lang, tham manh, thuat mang
doc sach » hoc sach, toc sach, nuoc sach
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
cac dac » cac dan, cac dai, cac bac
cac duc » cac du, cao duc, cac nuoc
hieu va » lieu va, hieu qua
mang xa » lang xa, mang may, dang xay

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach tham mang xa hoi. hieu va ((cac duc) or (cac dac)) ((van hanh) or (ban hanh)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach tham mang xa hoi. hieu va ((cac duc) OR (cac dac)) ((van hanh) OR (ban hanh)) tai cua tre.
• Adding a wildcard symbol may retrieve word variants: doc sach tham mang xa hoi. hieu va ((cac duc) or (cac dac)) ((van hanh) or (ban hanh)) tai cua tre*.