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
sach tay » xach tay, sach hay, sach nay
tu sach » thu sach, su sach, te sach
duc ban » duc van, dua ban, duc man
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
cua tre » cua te, cuu tre, cua triet
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 tay dang xa hoi. hieu va cam ((duc ban) OR (duc tan)) ((thanh hai) or (thanh phan)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tay dang xa hoi. hieu va cam ((duc ban) OR (duc tan)) ((thanh hai) OR (thanh phan)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tay dang xa hoi. hieu va cam ((duc ban) OR (duc tan)) ((thanh hai) or (thanh phan)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach tay dang xa hoi. hieu va cam ((duc ban) OR (duc tan)) ((thanh hai) or (thanh phan)) cua tre*.