Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
va thanh » gia thanh, va tinh, le thanh
sach thi » sach thu, sach tai, sach thieu
te sach » toc sach
hieu va » lieu va, hieu qua
hang xa » hoang xa, hang va, lang xa
hang ca » hang va, nang cao, hang tai
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
cam tu » cam thu, nam tu, dam tu
di cua » dai cua, doi cua, de cua

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

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