Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
thanh hai » thanh hoa, thanh san
tay dang » tay dong, tay dung, tay lang
tu sach » thu sach, te sach, tu cach
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
su sach » so sach, vu sach
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (su sach)) tay dang xa hoi. hieu va cam duc ban ((thanh hai) or (thanh phan)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) tay dang xa hoi. hieu va cam duc ban ((thanh hai) OR (thanh phan)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) tay dang xa hoi. hieu va cam duc ban ((thanh hai) or (thanh phan)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) tay dang xa hoi. hieu va cam duc ban ((thanh hai) or (thanh phan)) cua tre*.